128889712 has 40 divisors (see below), whose sum is σ = 285994592. Its totient is φ = 55123200.

The previous prime is 128889703. The next prime is 128889731. The reversal of 128889712 is 217988821.

It is a super-2 number, since 2×128889712² = 33225115718885888, which contains 22 as substring.

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, 73162 + ... + 74902.

Almost surely, 2^128889712 is an apocalyptic number.

It is an amenable number.

128889712 is an abundant number, since it is smaller than the sum of its proper divisors (157104880).

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

128889712 is a wasteful number, since it uses less digits than its factorization.

128889712 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2417 (or 2411 counting only the distinct ones).

The product of its digits is 129024, while the sum is 46.

The square root of 128889712 is about 11352.9604949546. The cubic root of 128889712 is about 505.1333987359.

The spelling of 128889712 in words is "one hundred twenty-eight million, eight hundred eighty-nine thousand, seven hundred twelve".