128919772 has 24 divisors (see below), whose sum is σ = 239591520. Its totient is φ = 60487680.

The previous prime is 128919757. The next prime is 128919781. The reversal of 128919772 is 277919821.

It is a super-2 number, since 2×128919772² = 33240615225063968, 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, 21772 + ... + 27052.

It is an arithmetic number, because the mean of its divisors is an integer number (9982980).

Almost surely, 2^128919772 is an apocalyptic number.

It is an amenable number.

128919772 is a deficient number, since it is larger than the sum of its proper divisors (110671748).

128919772 is a wasteful number, since it uses less digits than its factorization.

128919772 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5661 (or 5659 counting only the distinct ones).

The product of its digits is 127008, while the sum is 46.

The square root of 128919772 is about 11354.2843015313. The cubic root of 128919772 is about 505.1726651998.

The spelling of 128919772 in words is "one hundred twenty-eight million, nine hundred nineteen thousand, seven hundred seventy-two".