816764431 has 16 divisors (see below), whose sum is σ = 977702400. Its totient is φ = 667120608.

The previous prime is 816764413. The next prime is 816764437. The reversal of 816764431 is 134467618.

It is not a de Polignac number, because 816764431 - 2¹⁹ = 816240143 is a prime.

It is a super-2 number, since 2×816764431² = 1334208271493507522, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (816764437) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 33880 + ... + 52738.

It is an arithmetic number, because the mean of its divisors is an integer number (61106400).

Almost surely, 2^816764431 is an apocalyptic number.

816764431 is a deficient number, since it is larger than the sum of its proper divisors (160937969).

816764431 is a wasteful number, since it uses less digits than its factorization.

816764431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19158.

The product of its digits is 96768, while the sum is 40.

The square root of 816764431 is about 28579.0908007935. The cubic root of 816764431 is about 934.7574579410.

The spelling of 816764431 in words is "eight hundred sixteen million, seven hundred sixty-four thousand, four hundred thirty-one".