655776864 has 48 divisors (see below), whose sum is σ = 1912685040. Its totient is φ = 218592000.

The previous prime is 655776859. The next prime is 655776871. The reversal of 655776864 is 468677556.

655776864 is a `hidden beast` number, since 6 + 5 + 577 + 6 + 8 + 64 = 666.

It is a tau number, because it is divible by the number of its divisors (48).

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a self number, because there is not a number n which added to its sum of digits gives 655776864.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 378637 + ... + 380364.

It is an arithmetic number, because the mean of its divisors is an integer number (39847605).

Almost surely, 2^655776864 is an apocalyptic number.

It is an amenable number.

655776864 is an abundant number, since it is smaller than the sum of its proper divisors (1256908176).

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

655776864 is a wasteful number, since it uses less digits than its factorization.

655776864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 759020 (or 759006 counting only the distinct ones).

The product of its digits is 8467200, while the sum is 54.

The square root of 655776864 is about 25608.1405806825. The cubic root of 655776864 is about 868.7977686826.

The spelling of 655776864 in words is "six hundred fifty-five million, seven hundred seventy-six thousand, eight hundred sixty-four".