128392506 has 32 divisors (see below), whose sum is σ = 311256000. Its totient is φ = 38906640.

The previous prime is 128392477. The next prime is 128392507. The reversal of 128392506 is 605293821.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (128392507) 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, 107481 + ... + 108668.

It is an arithmetic number, because the mean of its divisors is an integer number (9726750).

Almost surely, 2^128392506 is an apocalyptic number.

128392506 is an abundant number, since it is smaller than the sum of its proper divisors (182863494).

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

128392506 is a wasteful number, since it uses less digits than its factorization.

128392506 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 216171 (or 216165 counting only the distinct ones).

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

The square root of 128392506 is about 11331.0416996850. The cubic root of 128392506 is about 504.4830261560.

The spelling of 128392506 in words is "one hundred twenty-eight million, three hundred ninety-two thousand, five hundred six".