646827372 has 36 divisors (see below), whose sum is σ = 1636704160. Its totient is φ = 215389152.

The previous prime is 646827361. The next prime is 646827487. The reversal of 646827372 is 273728646.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

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, 28758 + ... + 46050.

Almost surely, 2^646827372 is an apocalyptic number.

It is an amenable number.

646827372 is an abundant number, since it is smaller than the sum of its proper divisors (989876788).

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

646827372 is a wasteful number, since it uses less digits than its factorization.

646827372 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18342 (or 18337 counting only the distinct ones).

The product of its digits is 677376, while the sum is 45.

The square root of 646827372 is about 25432.8011040860. The cubic root of 646827372 is about 864.8274448365.

The spelling of 646827372 in words is "six hundred forty-six million, eight hundred twenty-seven thousand, three hundred seventy-two".