128988644 has 48 divisors (see below), whose sum is σ = 250145280. Its totient is φ = 57957120.

The previous prime is 128988637. The next prime is 128988661. The reversal of 128988644 is 446889821.

It is a junction number, because it is equal to n+sod(n) for n = 128988592 and 128988601.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 124352 + ... + 125384.

It is an arithmetic number, because the mean of its divisors is an integer number (5211360).

Almost surely, 2^128988644 is an apocalyptic number.

It is an amenable number.

128988644 is a deficient number, since it is larger than the sum of its proper divisors (121156636).

128988644 is a wasteful number, since it uses less digits than its factorization.

128988644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1140 (or 1138 counting only the distinct ones).

The product of its digits is 884736, while the sum is 50.

The square root of 128988644 is about 11357.3167605733. The cubic root of 128988644 is about 505.2626075918.

The spelling of 128988644 in words is "one hundred twenty-eight million, nine hundred eighty-eight thousand, six hundred forty-four".