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989999990 = 25714879511
BaseRepresentation
bin111011000000100…
…011001101110110
32112222212012200022
4323000203031312
54011414444430
6242123045142
733350601230
oct7300431566
92488765608
10989999990
11468913711
122376707b2
1312a148615
14956a7250
155bda84e5
hex3b023376

989999990 has 32 divisors (see below), whose sum is σ = 2038155264. Its totient is φ = 339164640.

The previous prime is 989999957. The next prime is 989999993. The reversal of 989999990 is 99999989.

989999990 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (989999993) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 99335 + ... + 108845.

It is an arithmetic number, because the mean of its divisors is an integer number (63692352).

Almost surely, 2989999990 is an apocalyptic number.

989999990 is an abundant number, since it is smaller than the sum of its proper divisors (1048155274).

989999990 is a wasteful number, since it uses less digits than its factorization.

989999990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11012.

The product of its (nonzero) digits is 38263752, while the sum is 71.

The square root of 989999990 is about 31464.2652861941. The cubic root of 989999990 is about 996.6554900569.

The spelling of 989999990 in words is "nine hundred eighty-nine million, nine hundred ninety-nine thousand, nine hundred ninety".

Divisors: 1 2 5 7 10 14 35 70 1487 2974 7435 9511 10409 14870 19022 20818 47555 52045 66577 95110 104090 133154 332885 665770 14142857 28285714 70714285 98999999 141428570 197999998 494999995 989999990