647152188 has 12 divisors (see below), whose sum is σ = 1510021800. Its totient is φ = 215717392.

The previous prime is 647152171. The next prime is 647152189. The reversal of 647152188 is 881251746.

It is a tau number, because it is divible by the number of its divisors (12).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (647152189) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 26964663 + ... + 26964686.

It is an arithmetic number, because the mean of its divisors is an integer number (125835150).

Almost surely, 2^647152188 is an apocalyptic number.

It is an amenable number.

647152188 is an abundant number, since it is smaller than the sum of its proper divisors (862869612).

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

647152188 is a wasteful number, since it uses less digits than its factorization.

647152188 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53929356 (or 53929354 counting only the distinct ones).

The product of its digits is 107520, while the sum is 42.

The square root of 647152188 is about 25439.1860718852. The cubic root of 647152188 is about 864.9721834974.

The spelling of 647152188 in words is "six hundred forty-seven million, one hundred fifty-two thousand, one hundred eighty-eight".