9902790432 has 72 divisors (see below), whose sum is σ = 29204085456. Its totient is φ = 3300927552.

The previous prime is 9902790421. The next prime is 9902790451. The reversal of 9902790432 is 2340972099.

It is a tau number, because it is divible by the number of its divisors (72).

It is a super-2 number, since 2×9902790432² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 628978 + ... + 644529.

It is an arithmetic number, because the mean of its divisors is an integer number (405612298).

Almost surely, 2^9902790432 is an apocalyptic number.

It is an amenable number.

9902790432 is an abundant number, since it is smaller than the sum of its proper divisors (19301295024).

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

9902790432 is a wasteful number, since it uses less digits than its factorization.

9902790432 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1273532 (or 1273512 counting only the distinct ones).

The product of its (nonzero) digits is 244944, while the sum is 45.

The square root of 9902790432 is about 99512.7651711076. The cubic root of 9902790432 is about 2147.4308907068.

The spelling of 9902790432 in words is "nine billion, nine hundred two million, seven hundred ninety thousand, four hundred thirty-two".