128738864 has 20 divisors (see below), whose sum is σ = 249722856. Its totient is φ = 64294272.

The previous prime is 128738849. The next prime is 128738879. The reversal of 128738864 is 468837821.

It is an interprime number because it is at equal distance from previous prime (128738849) and next prime (128738879).

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 3 ways as a sum of consecutive naturals, for example, 11027 + ... + 19469.

Almost surely, 2^128738864 is an apocalyptic number.

It is an amenable number.

128738864 is a deficient number, since it is larger than the sum of its proper divisors (120983992).

128738864 is an equidigital number, since it uses as much as digits as its factorization.

128738864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9404 (or 9398 counting only the distinct ones).

The product of its digits is 516096, while the sum is 47.

The square root of 128738864 is about 11346.3149965088. The cubic root of 128738864 is about 504.9362583339.

The spelling of 128738864 in words is "one hundred twenty-eight million, seven hundred thirty-eight thousand, eight hundred sixty-four".