128815860 has 48 divisors (see below), whose sum is σ = 361541376. Its totient is φ = 34269312.

The previous prime is 128815807. The next prime is 128815867. The reversal of 128815860 is 68518821.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128815867) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 25462 + ... + 30098.

It is an arithmetic number, because the mean of its divisors is an integer number (7532112).

Almost surely, 2^128815860 is an apocalyptic number.

128815860 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

128815860 is an abundant number, since it is smaller than the sum of its proper divisors (232725516).

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

128815860 is a wasteful number, since it uses less digits than its factorization.

128815860 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5112 (or 5110 counting only the distinct ones).

The product of its (nonzero) digits is 30720, while the sum is 39.

The square root of 128815860 is about 11349.7074852174. The cubic root of 128815860 is about 505.0369021820.

The spelling of 128815860 in words is "one hundred twenty-eight million, eight hundred fifteen thousand, eight hundred sixty".