128623506 has 32 divisors (see below), whose sum is σ = 282443328. Its totient is φ = 38725440.

The previous prime is 128623489. The next prime is 128623541. The reversal of 128623506 is 605326821.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4156 + ... + 16568.

It is an arithmetic number, because the mean of its divisors is an integer number (8826354).

Almost surely, 2^128623506 is an apocalyptic number.

128623506 is an abundant number, since it is smaller than the sum of its proper divisors (153819822).

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

128623506 is a wasteful number, since it uses less digits than its factorization.

128623506 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12586.

The product of its (nonzero) digits is 17280, while the sum is 33.

The square root of 128623506 is about 11341.2303565354. The cubic root of 128623506 is about 504.7853952047.

The spelling of 128623506 in words is "one hundred twenty-eight million, six hundred twenty-three thousand, five hundred six".