128979572 has 6 divisors (see below), whose sum is σ = 225714258. Its totient is φ = 64489784.

The previous prime is 128979569. The next prime is 128979577. The reversal of 128979572 is 275979821.

It can be written as a sum of positive squares in only one way, i.e., 107039716 + 21939856 = 10346^2 + 4684^2 .

It is a super-3 number, since 3×128979572³ (a number of 25 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 128979572.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128979577) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16122443 + ... + 16122450.

It is an arithmetic number, because the mean of its divisors is an integer number (37619043).

Almost surely, 2^128979572 is an apocalyptic number.

It is an amenable number.

128979572 is a deficient number, since it is larger than the sum of its proper divisors (96734686).

128979572 is a wasteful number, since it uses less digits than its factorization.

128979572 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32244897 (or 32244895 counting only the distinct ones).

The product of its digits is 635040, while the sum is 50.

The square root of 128979572 is about 11356.9173634398. The cubic root of 128979572 is about 505.2507619758.

The spelling of 128979572 in words is "one hundred twenty-eight million, nine hundred seventy-nine thousand, five hundred seventy-two".