655817880 has 32 divisors (see below), whose sum is σ = 1967454000. Its totient is φ = 174884736.

The previous prime is 655817879. The next prime is 655817887. The reversal of 655817880 is 88718556.

It is a Smith number, since the sum of its digits (48) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (655817887) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2732455 + ... + 2732694.

Almost surely, 2^655817880 is an apocalyptic number.

655817880 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

655817880 is an abundant number, since it is smaller than the sum of its proper divisors (1311636120).

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

655817880 is a wasteful number, since it uses less digits than its factorization.

655817880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5465163 (or 5465159 counting only the distinct ones).

The product of its (nonzero) digits is 537600, while the sum is 48.

The square root of 655817880 is about 25608.9414072507. The cubic root of 655817880 is about 868.8158814831.

The spelling of 655817880 in words is "six hundred fifty-five million, eight hundred seventeen thousand, eight hundred eighty".