128512864 has 12 divisors (see below), whose sum is σ = 253009764. Its totient is φ = 64256416.

The previous prime is 128512861. The next prime is 128512883. The reversal of 128512864 is 468215821.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128512861) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2007982 + ... + 2008045.

It is an arithmetic number, because the mean of its divisors is an integer number (21084147).

Almost surely, 2^128512864 is an apocalyptic number.

It is an amenable number.

128512864 is a deficient number, since it is larger than the sum of its proper divisors (124496900).

128512864 is an equidigital number, since it uses as much as digits as its factorization.

128512864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4016037 (or 4016029 counting only the distinct ones).

The product of its digits is 30720, while the sum is 37.

The square root of 128512864 is about 11336.3514412707. The cubic root of 128512864 is about 504.6406148057.

The spelling of 128512864 in words is "one hundred twenty-eight million, five hundred twelve thousand, eight hundred sixty-four".