656133440 has 28 divisors (see below), whose sum is σ = 1562418516. Its totient is φ = 262453248.

The previous prime is 656133427. The next prime is 656133461. The reversal of 656133440 is 44331656.

It can be written as a sum of positive squares in 2 ways, for example, as 401922304 + 254211136 = 20048^2 + 15944^2 .

It is a super-2 number, since 2×656133440² = 861022182172467200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (32).

It is a junction number, because it is equal to n+sod(n) for n = 656133397 and 656133406.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1024889 + ... + 1025528.

Almost surely, 2^656133440 is an apocalyptic number.

It is an amenable number.

656133440 is an abundant number, since it is smaller than the sum of its proper divisors (906285076).

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

656133440 is a wasteful number, since it uses less digits than its factorization.

656133440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2050434 (or 2050424 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 32.

The square root of 656133440 is about 25615.1017956205. The cubic root of 656133440 is about 868.9552085669.

The spelling of 656133440 in words is "six hundred fifty-six million, one hundred thirty-three thousand, four hundred forty".