991956432 has 40 divisors (see below), whose sum is σ = 2617082496. Its totient is φ = 323616256.

The previous prime is 991956401. The next prime is 991956457. The reversal of 991956432 is 234659199.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 217593 + ... + 222104.

Almost surely, 2^991956432 is an apocalyptic number.

It is an amenable number.

991956432 is an abundant number, since it is smaller than the sum of its proper divisors (1625126064).

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

991956432 is a wasteful number, since it uses less digits than its factorization.

991956432 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 439755 (or 439749 counting only the distinct ones).

The product of its digits is 524880, while the sum is 48.

The square root of 991956432 is about 31495.3398457613. The cubic root of 991956432 is about 997.3115895930.

The spelling of 991956432 in words is "nine hundred ninety-one million, nine hundred fifty-six thousand, four hundred thirty-two".