646513508 has 12 divisors (see below), whose sum is σ = 1132443312. Its totient is φ = 322958280.

The previous prime is 646513493. The next prime is 646513537. The reversal of 646513508 is 805315646.

It is a hoax number, since the sum of its digits (38) coincides with the sum of the digits of its distinct prime factors.

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 in 3 ways as a sum of consecutive naturals, for example, 69710 + ... + 78437.

It is an arithmetic number, because the mean of its divisors is an integer number (94370276).

Almost surely, 2^646513508 is an apocalyptic number.

It is an amenable number.

646513508 is a deficient number, since it is larger than the sum of its proper divisors (485929804).

646513508 is a wasteful number, since it uses less digits than its factorization.

646513508 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 149242 (or 149240 counting only the distinct ones).

The product of its (nonzero) digits is 86400, while the sum is 38.

The square root of 646513508 is about 25426.6298985925. The cubic root of 646513508 is about 864.6875403691.

The spelling of 646513508 in words is "six hundred forty-six million, five hundred thirteen thousand, five hundred eight".