128690404 has 12 divisors (see below), whose sum is σ = 225478204. Its totient is φ = 64268064.

The previous prime is 128690399. The next prime is 128690417. The reversal of 128690404 is 404096821.

It can be written as a sum of positive squares in 2 ways, for example, as 73960000 + 54730404 = 8600^2 + 7398^2 .

It is a super-2 number, since 2×128690404² = 33122440163366432, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 128690404.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15447 + ... + 22270.

Almost surely, 2^128690404 is an apocalyptic number.

It is an amenable number.

128690404 is a deficient number, since it is larger than the sum of its proper divisors (96787800).

128690404 is a wasteful number, since it uses less digits than its factorization.

128690404 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38574 (or 38572 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 34.

The square root of 128690404 is about 11344.1793004166. The cubic root of 128690404 is about 504.8728941945.

The spelling of 128690404 in words is "one hundred twenty-eight million, six hundred ninety thousand, four hundred four".