646617552 has 40 divisors (see below), whose sum is σ = 1909062336. Its totient is φ = 184747776.

The previous prime is 646617547. The next prime is 646617563. The reversal of 646617552 is 255716646.

It is a super-2 number, since 2×646617552² = 836228517108945408, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 961893 + ... + 962564.

Almost surely, 2^646617552 is an apocalyptic number.

It is an amenable number.

646617552 is an abundant number, since it is smaller than the sum of its proper divisors (1262444784).

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

646617552 is a wasteful number, since it uses less digits than its factorization.

646617552 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1924475 (or 1924469 counting only the distinct ones).

The product of its digits is 302400, while the sum is 42.

The square root of 646617552 is about 25428.6757814873. The cubic root of 646617552 is about 864.7339228621.

The spelling of 646617552 in words is "six hundred forty-six million, six hundred seventeen thousand, five hundred fifty-two".