990881432 has 16 divisors (see below), whose sum is σ = 1872533760. Its totient is φ = 491539104.

The previous prime is 990881429. The next prime is 990881443. The reversal of 990881432 is 234188099.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 486623 + ... + 488654.

It is an arithmetic number, because the mean of its divisors is an integer number (117033360).

Almost surely, 2^990881432 is an apocalyptic number.

It is an amenable number.

990881432 is a deficient number, since it is larger than the sum of its proper divisors (881652328).

990881432 is a wasteful number, since it uses less digits than its factorization.

990881432 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 975410 (or 975406 counting only the distinct ones).

The product of its (nonzero) digits is 124416, while the sum is 44.

The square root of 990881432 is about 31478.2692027373. The cubic root of 990881432 is about 996.9511915468.

The spelling of 990881432 in words is "nine hundred ninety million, eight hundred eighty-one thousand, four hundred thirty-two".