656011840 has 112 divisors (see below), whose sum is σ = 1713731904. Its totient is φ = 237209600.

The previous prime is 656011823. The next prime is 656011859. The reversal of 656011840 is 48110656.

It is a hoax number, since the sum of its digits (31) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 798630 + ... + 799450.

Almost surely, 2^656011840 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 656011840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (856865952).

656011840 is an abundant number, since it is smaller than the sum of its proper divisors (1057720064).

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

656011840 is a wasteful number, since it uses less digits than its factorization.

656011840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1076 (or 1066 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 31.

The square root of 656011840 is about 25612.7280858561. The cubic root of 656011840 is about 868.9015246285.

The spelling of 656011840 in words is "six hundred fifty-six million, eleven thousand, eight hundred forty".