128860506 has 24 divisors (see below), whose sum is σ = 281211840. Its totient is φ = 42643656.

The previous prime is 128860481. The next prime is 128860507. The reversal of 128860506 is 605068821.

128860506 = 893² + 894² + ... + 1031².

It is a happy number.

128860506 is a `hidden beast` number, since 12 + 88 + 60 + 506 = 666.

It is not an unprimeable number, because it can be changed into a prime (128860507) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 23250 + ... + 28253.

It is an arithmetic number, because the mean of its divisors is an integer number (11717160).

Almost surely, 2^128860506 is an apocalyptic number.

128860506 is an abundant number, since it is smaller than the sum of its proper divisors (152351334).

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

128860506 is a wasteful number, since it uses less digits than its factorization.

128860506 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51650 (or 51647 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 36.

The square root of 128860506 is about 11351.6741496574. The cubic root of 128860506 is about 505.0952419783.

The spelling of 128860506 in words is "one hundred twenty-eight million, eight hundred sixty thousand, five hundred six".