656043920 has 80 divisors (see below), whose sum is σ = 1762922880. Its totient is φ = 222385152.

The previous prime is 656043901. The next prime is 656043937. The reversal of 656043920 is 29340656.

656043920 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (35).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 43259 + ... + 56421.

It is an arithmetic number, because the mean of its divisors is an integer number (22036536).

Almost surely, 2^656043920 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 656043920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (881461440).

656043920 is an abundant number, since it is smaller than the sum of its proper divisors (1106878960).

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

656043920 is a wasteful number, since it uses less digits than its factorization.

656043920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13272 (or 13266 counting only the distinct ones).

The product of its (nonzero) digits is 38880, while the sum is 35.

The square root of 656043920 is about 25613.3543293338. The cubic root of 656043920 is about 868.9156879432.

The spelling of 656043920 in words is "six hundred fifty-six million, forty-three thousand, nine hundred twenty".