656445672 has 48 divisors (see below), whose sum is σ = 1799310240. Its totient is φ = 216176928.

The previous prime is 656445631. The next prime is 656445719. The reversal of 656445672 is 276544656.

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 48948 + ... + 60899.

It is an arithmetic number, because the mean of its divisors is an integer number (37485630).

Almost surely, 2^656445672 is an apocalyptic number.

It is an amenable number.

656445672 is an abundant number, since it is smaller than the sum of its proper divisors (1142864568).

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

656445672 is a wasteful number, since it uses less digits than its factorization.

656445672 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 109942 (or 109935 counting only the distinct ones).

The product of its digits is 1209600, while the sum is 45.

The square root of 656445672 is about 25621.1957566387. The cubic root of 656445672 is about 869.0930223005.

The spelling of 656445672 in words is "six hundred fifty-six million, four hundred forty-five thousand, six hundred seventy-two".