655491880 has 32 divisors (see below), whose sum is σ = 1495635840. Its totient is φ = 258502720.

The previous prime is 655491877. The next prime is 655491911. The reversal of 655491880 is 88194556.

It is a self number, because there is not a number n which added to its sum of digits gives 655491880.

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, 112564 + ... + 118243.

It is an arithmetic number, because the mean of its divisors is an integer number (46738620).

Almost surely, 2^655491880 is an apocalyptic number.

It is an amenable number.

655491880 is an abundant number, since it is smaller than the sum of its proper divisors (840143960).

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

655491880 is a wasteful number, since it uses less digits than its factorization.

655491880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 230889 (or 230885 counting only the distinct ones).

The product of its (nonzero) digits is 345600, while the sum is 46.

The square root of 655491880 is about 25602.5756516800. The cubic root of 655491880 is about 868.6718979526.

It can be divided in two parts, 65 and 5491880, that added together give a palindrome (5491945).

The spelling of 655491880 in words is "six hundred fifty-five million, four hundred ninety-one thousand, eight hundred eighty".