646663536 has 60 divisors (see below), whose sum is σ = 1811533360. Its totient is φ = 215343360.

The previous prime is 646663529. The next prime is 646663559. The reversal of 646663536 is 635366646.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 646663491 and 646663500.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 230301 + ... + 233091.

Almost surely, 2^646663536 is an apocalyptic number.

It is an amenable number.

646663536 is an abundant number, since it is smaller than the sum of its proper divisors (1164869824).

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

646663536 is a wasteful number, since it uses less digits than its factorization.

646663536 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4414 (or 4405 counting only the distinct ones).

The product of its digits is 1399680, while the sum is 45.

The square root of 646663536 is about 25429.5799414776. The cubic root of 646663536 is about 864.7544208015.

The spelling of 646663536 in words is "six hundred forty-six million, six hundred sixty-three thousand, five hundred thirty-six".