656000000 has 154 divisors (see below), whose sum is σ = 1679158194. Its totient is φ = 256000000.

The previous prime is 655999999. The next prime is 656000003. The reversal of 656000000 is 656.

It is a happy number.

It can be written as a sum of positive squares in 7 ways, for example, as 593019904 + 62980096 = 24352^2 + 7936^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (656000003) by changing a digit.

It is a polite number, since it can be written in 13 ways as a sum of consecutive naturals, for example, 15999980 + ... + 16000020.

Almost surely, 2^656000000 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 656000000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (839579097).

656000000 is an abundant number, since it is smaller than the sum of its proper divisors (1023158194).

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

656000000 is an frugal number, since it uses more digits than its factorization.

656000000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 91 (or 48 counting only the distinct ones).

The product of its (nonzero) digits is 180, while the sum is 17.

The square root of 656000000 is about 25612.4969497314. The cubic root of 656000000 is about 868.8962971537.

Adding to 656000000 its reverse (656), we get a palindrome (656000656).

Multiplying 656000000 by its reverse (656), we get a square (430336000000 = 656000²).

656000000 divided by its reverse (656) gives a 6-th power (1000000 = 10⁶).

The spelling of 656000000 in words is "six hundred fifty-six million", and thus it is an aban number.