647696832 has 56 divisors (see below), whose sum is σ = 1716633600. Its totient is φ = 215529216.

The previous prime is 647696809. The next prime is 647696837. The reversal of 647696832 is 238696746.

It is a happy number.

It is a super-2 number, since 2×647696832² = 839022372365672448, which contains 22 as substring.

It is a Smith number, since the sum of its digits (51) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (647696837) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 123969 + ... + 129087.

Almost surely, 2^647696832 is an apocalyptic number.

It is an amenable number.

647696832 is an abundant number, since it is smaller than the sum of its proper divisors (1068936768).

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

647696832 is a wasteful number, since it uses less digits than its factorization.

647696832 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5793 (or 5783 counting only the distinct ones).

The product of its digits is 2612736, while the sum is 51.

The square root of 647696832 is about 25449.8886441572. Note that the first 3 decimals coincide. The cubic root of 647696832 is about 865.2147693067.

The spelling of 647696832 in words is "six hundred forty-seven million, six hundred ninety-six thousand, eight hundred thirty-two".