646464232 has 8 divisors (see below), whose sum is σ = 1212120450. Its totient is φ = 323232112.

The previous prime is 646464223. The next prime is 646464251. The reversal of 646464232 is 232464646.

It can be written as a sum of positive squares in only one way, i.e., 401040676 + 245423556 = 20026^2 + 15666^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a hoax number, since the sum of its digits (37) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 646464191 and 646464200.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40404007 + ... + 40404022.

Almost surely, 2^646464232 is an apocalyptic number.

It is an amenable number.

646464232 is a deficient number, since it is larger than the sum of its proper divisors (565656218).

646464232 is a wasteful number, since it uses less digits than its factorization.

646464232 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80808035 (or 80808031 counting only the distinct ones).

The product of its digits is 165888, while the sum is 37.

The square root of 646464232 is about 25425.6608960318. The cubic root of 646464232 is about 864.6655715444.

The spelling of 646464232 in words is "six hundred forty-six million, four hundred sixty-four thousand, two hundred thirty-two".