656366440 has 32 divisors (see below), whose sum is σ = 1478632680. Its totient is φ = 262225152.

The previous prime is 656366429. The next prime is 656366443. The reversal of 656366440 is 44663656.

It can be written as a sum of positive squares in 4 ways, for example, as 223143844 + 433222596 = 14938^2 + 20814^2 .

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a junction number, because it is equal to n+sod(n) for n = 656366393 and 656366402.

It is not an unprimeable number, because it can be changed into a prime (656366443) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 24502 + ... + 43738.

Almost surely, 2^656366440 is an apocalyptic number.

It is an amenable number.

656366440 is an abundant number, since it is smaller than the sum of its proper divisors (822266240).

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

656366440 is a wasteful number, since it uses less digits than its factorization.

656366440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20101 (or 20097 counting only the distinct ones).

The product of its (nonzero) digits is 311040, while the sum is 40.

The square root of 656366440 is about 25619.6494901862. The cubic root of 656366440 is about 869.0580548224.

The spelling of 656366440 in words is "six hundred fifty-six million, three hundred sixty-six thousand, four hundred forty".