128928726 has 16 divisors (see below), whose sum is σ = 286508400. Its totient is φ = 42976224.

The previous prime is 128928719. The next prime is 128928727. The reversal of 128928726 is 627829821.

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128928727) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1193731 + ... + 1193838.

It is an arithmetic number, because the mean of its divisors is an integer number (17906775).

Almost surely, 2^128928726 is an apocalyptic number.

128928726 is an abundant number, since it is smaller than the sum of its proper divisors (157579674).

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

128928726 is a wasteful number, since it uses less digits than its factorization.

128928726 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2387580 (or 2387574 counting only the distinct ones).

The product of its digits is 193536, while the sum is 45.

The square root of 128928726 is about 11354.6785951871. The cubic root of 128928726 is about 505.1843603579.

The spelling of 128928726 in words is "one hundred twenty-eight million, nine hundred twenty-eight thousand, seven hundred twenty-six".