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899999980 = 22511191391549
BaseRepresentation
bin110101101001001…
…110100011101100
32022201111201212121
4311221032203230
53320344444410
6225150042324
731205605435
oct6551164354
92281451777
10899999980
11422032340
122114a93a4
131145c6689
148775a48c
155402b9da
hex35a4e8ec

899999980 has 96 divisors (see below), whose sum is σ = 2187360000. Its totient is φ = 307618560.

The previous prime is 899999963. The next prime is 900000011. The reversal of 899999980 is 89999998.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 580246 + ... + 581794.

It is an arithmetic number, because the mean of its divisors is an integer number (22785000).

Almost surely, 2899999980 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 899999980, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1093680000).

899999980 is an abundant number, since it is smaller than the sum of its proper divisors (1287360020).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

899999980 is a wasteful number, since it uses less digits than its factorization.

899999980 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1727 (or 1725 counting only the distinct ones).

The product of its (nonzero) digits is 34012224, while the sum is 70.

The square root of 899999980 is about 29999.9996666667. Note that the first 3 decimals coincide. The cubic root of 899999980 is about 965.4893774539.

The spelling of 899999980 in words is "eight hundred ninety-nine million, nine hundred ninety-nine thousand, nine hundred eighty".

Divisors: 1 2 4 5 10 11 19 20 22 38 44 55 76 95 110 139 190 209 220 278 380 418 556 695 836 1045 1390 1529 1549 2090 2641 2780 3058 3098 4180 5282 6116 6196 7645 7745 10564 13205 15290 15490 17039 26410 29051 29431 30580 30980 34078 52820 58102 58862 68156 85195 116204 117724 145255 147155 170390 215311 290510 294310 323741 340780 430622 581020 588620 647482 861244 1076555 1294964 1618705 2153110 2368421 3237410 4090909 4306220 4736842 6474820 8181818 9473684 11842105 16363636 20454545 23684210 40909090 44999999 47368420 81818180 89999998 179999996 224999995 449999990 899999980