656872728 has 16 divisors (see below), whose sum is σ = 1642181880. Its totient is φ = 218957568.

The previous prime is 656872721. The next prime is 656872739. The reversal of 656872728 is 827278656.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (656872721) 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, 13684825 + ... + 13684872.

Almost surely, 2^656872728 is an apocalyptic number.

It is an amenable number.

656872728 is an abundant number, since it is smaller than the sum of its proper divisors (985309152).

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

656872728 is a wasteful number, since it uses less digits than its factorization.

656872728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27369706 (or 27369702 counting only the distinct ones).

The product of its digits is 2257920, while the sum is 51.

The square root of 656872728 is about 25629.5284388925. The cubic root of 656872728 is about 869.2814465929.

The spelling of 656872728 in words is "six hundred fifty-six million, eight hundred seventy-two thousand, seven hundred twenty-eight".