646501764 has 24 divisors (see below), whose sum is σ = 1509641280. Its totient is φ = 215338144.

The previous prime is 646501759. The next prime is 646501831. The reversal of 646501764 is 467105646.

It is a super-2 number, since 2×646501764² = 835929061710223392, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3144 + ... + 36095.

It is an arithmetic number, because the mean of its divisors is an integer number (62901720).

Almost surely, 2^646501764 is an apocalyptic number.

It is an amenable number.

646501764 is an abundant number, since it is smaller than the sum of its proper divisors (863139516).

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

646501764 is a wasteful number, since it uses less digits than its factorization.

646501764 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40619 (or 40617 counting only the distinct ones).

The product of its (nonzero) digits is 120960, while the sum is 39.

The square root of 646501764 is about 25426.3989585627. The cubic root of 646501764 is about 864.6823046177.

The spelling of 646501764 in words is "six hundred forty-six million, five hundred one thousand, seven hundred sixty-four".