656020000 has 60 divisors (see below), whose sum is σ = 1613956806. Its totient is φ = 262400000.

The previous prime is 656019989. The next prime is 656020003. The reversal of 656020000 is 20656.

It can be written as a sum of positive squares in 5 ways, for example, as 4545424 + 651474576 = 2132^2 + 25524^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 656020000.

It is not an unprimeable number, because it can be changed into a prime (656020003) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 3600 + ... + 36400.

Almost surely, 2^656020000 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 656020000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (806978403).

656020000 is an abundant number, since it is smaller than the sum of its proper divisors (957936806).

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

656020000 is an equidigital number, since it uses as much as digits as its factorization.

656020000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32831 (or 32808 counting only the distinct ones).

The product of its (nonzero) digits is 360, while the sum is 19.

The square root of 656020000 is about 25612.8873811603. The cubic root of 656020000 is about 868.9051273109.

Adding to 656020000 its reverse (20656), we get a palindrome (656040656).

The spelling of 656020000 in words is "six hundred fifty-six million, twenty thousand".