128923506 has 24 divisors (see below), whose sum is σ = 279552000. Its totient is φ = 42941016.

The previous prime is 128923489. The next prime is 128923523. The reversal of 128923506 is 605329821.

128923506 is a `hidden beast` number, since 128 + 9 + 23 + 506 = 666.

It is an interprime number because it is at equal distance from previous prime (128923489) and next prime (128923523).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 34191 + ... + 37773.

It is an arithmetic number, because the mean of its divisors is an integer number (11648000).

Almost surely, 2^128923506 is an apocalyptic number.

128923506 is an abundant number, since it is smaller than the sum of its proper divisors (150628494).

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

128923506 is a wasteful number, since it uses less digits than its factorization.

128923506 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5590 (or 5587 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 36.

The square root of 128923506 is about 11354.4487316646. The cubic root of 128923506 is about 505.1775423843.

The spelling of 128923506 in words is "one hundred twenty-eight million, nine hundred twenty-three thousand, five hundred six".