656670720 has 152 divisors (see below), whose sum is σ = 2113925184. Its totient is φ = 174063616.

The previous prime is 656670701. The next prime is 656670731. The reversal of 656670720 is 27076656.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3932077 + ... + 3932243.

Almost surely, 2^656670720 is an apocalyptic number.

656670720 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 656670720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1056962592).

656670720 is an abundant number, since it is smaller than the sum of its proper divisors (1457254464).

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

656670720 is an frugal number, since it uses more digits than its factorization.

656670720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 211 (or 177 counting only the distinct ones).

The product of its (nonzero) digits is 105840, while the sum is 39.

The square root of 656670720 is about 25625.5872127840. The cubic root of 656670720 is about 869.1923274464.

The spelling of 656670720 in words is "six hundred fifty-six million, six hundred seventy thousand, seven hundred twenty".