646636488 has 64 divisors (see below), whose sum is σ = 1645056000. Its totient is φ = 211778112.

The previous prime is 646636477. The next prime is 646636561. The reversal of 646636488 is 884636646.

It is a happy number.

It is a super-2 number, since 2×646636488² = 836277495225948288, which contains 22 as substring.

It is a nude number because it is divisible by every one of its digits.

It is a self number, because there is not a number n which added to its sum of digits gives 646636488.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 452431 + ... + 453857.

It is an arithmetic number, because the mean of its divisors is an integer number (25704000).

Almost surely, 2^646636488 is an apocalyptic number.

It is an amenable number.

646636488 is an abundant number, since it is smaller than the sum of its proper divisors (998419512).

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

646636488 is a wasteful number, since it uses less digits than its factorization.

646636488 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1754 (or 1750 counting only the distinct ones).

The product of its digits is 3981312, while the sum is 51.

The square root of 646636488 is about 25429.0481143121. The cubic root of 646636488 is about 864.7423639371.

The spelling of 646636488 in words is "six hundred forty-six million, six hundred thirty-six thousand, four hundred eighty-eight".