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989928820 = 2251511811811
BaseRepresentation
bin111011000000010…
…001110101110100
32112222201121001101
4323000101311310
54011410210240
6242121335444
733350153566
oct7300216564
92488647041
10989928820
114688751a1
12237637584
1312a1220ca
1495689336
155bd9239a
hex3b011d74

989928820 has 48 divisors (see below), whose sum is σ = 2105341056. Its totient is φ = 390960000.

The previous prime is 989928817. The next prime is 989928839. The reversal of 989928820 is 28829989.

989928820 = T1 + T2 + ... + T1810.

989928820 is a nontrivial binomial coefficient, being equal to C(1812, 3).

It is a congruent number.

It is an unprimeable number.

It is the 1810-th tetrahedral number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 545715 + ... + 547525.

It is an arithmetic number, because the mean of its divisors is an integer number (43861272).

Almost surely, 2989928820 is an apocalyptic number.

It is an amenable number.

989928820 is an abundant number, since it is smaller than the sum of its proper divisors (1115412236).

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

989928820 is a wasteful number, since it uses less digits than its factorization.

989928820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2152 (or 2150 counting only the distinct ones).

The product of its (nonzero) digits is 1492992, while the sum is 55.

The square root of 989928820 is about 31463.1343003204. The cubic root of 989928820 is about 996.6316066657.

The spelling of 989928820 in words is "nine hundred eighty-nine million, nine hundred twenty-eight thousand, eight hundred twenty".