431320428 has 72 divisors (see below), whose sum is σ = 1359321600. Its totient is φ = 112030560.

The previous prime is 431320397. The next prime is 431320441. The reversal of 431320428 is 824023134.

431320428 is a `hidden beast` number, since 431 + 3 + 204 + 28 = 666.

It is a super-2 number, since 2×431320428² = 372074623220206368, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 75028 + ... + 80571.

Almost surely, 2^431320428 is an apocalyptic number.

It is an amenable number.

431320428 is an abundant number, since it is smaller than the sum of its proper divisors (928001172).

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

431320428 is a wasteful number, since it uses less digits than its factorization.

431320428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 155627 (or 155622 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 27.

The square root of 431320428 is about 20768.2552950410. The cubic root of 431320428 is about 755.5560297415.

The spelling of 431320428 in words is "four hundred thirty-one million, three hundred twenty thousand, four hundred twenty-eight".