656838628 has 6 divisors (see below), whose sum is σ = 1149467606. Its totient is φ = 328419312.

The previous prime is 656838619. The next prime is 656838629. The reversal of 656838628 is 826838656.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 638673984 + 18164644 = 25272^2 + 4262^2 .

It is not an unprimeable number, because it can be changed into a prime (656838629) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82104825 + ... + 82104832.

Almost surely, 2^656838628 is an apocalyptic number.

It is an amenable number.

656838628 is a deficient number, since it is larger than the sum of its proper divisors (492628978).

656838628 is a wasteful number, since it uses less digits than its factorization.

656838628 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 164209661 (or 164209659 counting only the distinct ones).

The product of its digits is 3317760, while the sum is 52.

The square root of 656838628 is about 25628.8631819673. The cubic root of 656838628 is about 869.2664040998.

The spelling of 656838628 in words is "six hundred fifty-six million, eight hundred thirty-eight thousand, six hundred twenty-eight".