655128864 has 384 divisors, whose sum is σ = 2255662080. Its totient is φ = 183140352.

The previous prime is 655128863. The next prime is 655128871. The reversal of 655128864 is 468821556.

It is not an unprimeable number, because it can be changed into a prime (655128863) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 8974332 + ... + 8974404.

It is an arithmetic number, because the mean of its divisors is an integer number (5874120).

Almost surely, 2^655128864 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 655128864, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1127831040).

655128864 is an abundant number, since it is smaller than the sum of its proper divisors (1600533216).

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

655128864 is a wasteful number, since it uses less digits than its factorization.

655128864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 169 (or 155 counting only the distinct ones).

The product of its digits is 460800, while the sum is 45.

The square root of 655128864 is about 25595.4852268911. The cubic root of 655128864 is about 868.5115094779.

The spelling of 655128864 in words is "six hundred fifty-five million, one hundred twenty-eight thousand, eight hundred sixty-four".