128616864 has 24 divisors (see below), whose sum is σ = 337619520. Its totient is φ = 42872256.

The previous prime is 128616823. The next prime is 128616869. The reversal of 128616864 is 468616821.

It is a tau number, because it is divible by the number of its divisors (24).

It is a hoax number, since the sum of its digits (42) coincides with the sum of the digits of its distinct prime factors.

It is a nude number because it is divisible by every one of its digits.

It is not an unprimeable number, because it can be changed into a prime (128616869) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 669784 + ... + 669975.

It is an arithmetic number, because the mean of its divisors is an integer number (14067480).

Almost surely, 2^128616864 is an apocalyptic number.

It is an amenable number.

128616864 is an abundant number, since it is smaller than the sum of its proper divisors (209002656).

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

128616864 is a wasteful number, since it uses less digits than its factorization.

128616864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1339772 (or 1339764 counting only the distinct ones).

The product of its digits is 110592, while the sum is 42.

The square root of 128616864 is about 11340.9375273828. The cubic root of 128616864 is about 504.7767061700.

The spelling of 128616864 in words is "one hundred twenty-eight million, six hundred sixteen thousand, eight hundred sixty-four".