656752740 has 96 divisors (see below), whose sum is σ = 2109784320. Its totient is φ = 149531136.

The previous prime is 656752711. The next prime is 656752753. The reversal of 656752740 is 47257656.

It is a super-2 number, since 2×656752740² = 862648322995015200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a junction number, because it is equal to n+sod(n) for n = 656752692 and 656752701.

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 31 ways as a sum of consecutive naturals, for example, 110074 + ... + 115886.

It is an arithmetic number, because the mean of its divisors is an integer number (21976920).

Almost surely, 2^656752740 is an apocalyptic number.

656752740 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 656752740, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1054892160).

656752740 is an abundant number, since it is smaller than the sum of its proper divisors (1453031580).

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

656752740 is a wasteful number, since it uses less digits than its factorization.

656752740 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6101 (or 6099 counting only the distinct ones).

The product of its (nonzero) digits is 352800, while the sum is 42.

The square root of 656752740 is about 25627.1875163858. The cubic root of 656752740 is about 869.2285141199.

The spelling of 656752740 in words is "six hundred fifty-six million, seven hundred fifty-two thousand, seven hundred forty".