128812520 has 32 divisors (see below), whose sum is σ = 296572320. Its totient is φ = 50326080.

The previous prime is 128812511. The next prime is 128812547. The reversal of 128812520 is 25218821.

It is a happy 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, 35726 + ... + 39165.

It is an arithmetic number, because the mean of its divisors is an integer number (9267885).

Almost surely, 2^128812520 is an apocalyptic number.

128812520 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

128812520 is an abundant number, since it is smaller than the sum of its proper divisors (167759800).

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

128812520 is a wasteful number, since it uses less digits than its factorization.

128812520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 74945 (or 74941 counting only the distinct ones).

The product of its (nonzero) digits is 2560, while the sum is 29.

The square root of 128812520 is about 11349.5603439076. The cubic root of 128812520 is about 505.0325371971.

The spelling of 128812520 in words is "one hundred twenty-eight million, eight hundred twelve thousand, five hundred twenty".