128913888 has 48 divisors (see below), whose sum is σ = 339413760. Its totient is φ = 42842496.

The previous prime is 128913877. The next prime is 128913893. The reversal of 128913888 is 888319821.

It is a tau number, because it is divible by the number of its divisors (48).

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 33403 + ... + 37061.

It is an arithmetic number, because the mean of its divisors is an integer number (7071120).

Almost surely, 2^128913888 is an apocalyptic number.

It is an amenable number.

128913888 is an abundant number, since it is smaller than the sum of its proper divisors (210499872).

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

128913888 is a wasteful number, since it uses less digits than its factorization.

128913888 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4039 (or 4031 counting only the distinct ones).

The product of its digits is 221184, while the sum is 48.

The square root of 128913888 is about 11354.0251893326. The cubic root of 128913888 is about 505.1649795900.

The spelling of 128913888 in words is "one hundred twenty-eight million, nine hundred thirteen thousand, eight hundred eighty-eight".