128372864 has 16 divisors (see below), whose sum is σ = 255743070. Its totient is φ = 64186368.

The previous prime is 128372857. The next prime is 128372921. The reversal of 128372864 is 468273821.

It can be written as a sum of positive squares in only one way, i.e., 116812864 + 11560000 = 10808^2 + 3400^2 .

It is a tau number, because it is divible by the number of its divisors (16).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 501329 + ... + 501584.

Almost surely, 2^128372864 is an apocalyptic number.

It is an amenable number.

128372864 is a deficient number, since it is larger than the sum of its proper divisors (127370206).

128372864 is an equidigital number, since it uses as much as digits as its factorization.

128372864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1002927 (or 1002915 counting only the distinct ones).

The product of its digits is 129024, while the sum is 41.

The square root of 128372864 is about 11330.1749324536. The cubic root of 128372864 is about 504.4572988991.

It can be divided in two parts, 1283 and 72864, that added together give a palindrome (74147).

The spelling of 128372864 in words is "one hundred twenty-eight million, three hundred seventy-two thousand, eight hundred sixty-four".