128928867 has 32 divisors (see below), whose sum is σ = 189734400. Its totient is φ = 77511168.

The previous prime is 128928859. The next prime is 128928881. The reversal of 128928867 is 768829821.

It is a happy number.

It is not a de Polignac number, because 128928867 - 2³ = 128928859 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is not an unprimeable number, because it can be changed into a prime (128928827) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 264498 + ... + 264984.

It is an arithmetic number, because the mean of its divisors is an integer number (5929200).

Almost surely, 2^128928867 is an apocalyptic number.

128928867 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

128928867 is a deficient number, since it is larger than the sum of its proper divisors (60805533).

128928867 is a wasteful number, since it uses less digits than its factorization.

128928867 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 715.

The product of its digits is 774144, while the sum is 51.

The square root of 128928867 is about 11354.6848040798. The cubic root of 128928867 is about 505.1845445190.

It can be divided in two parts, 128928 and 867, that added together give a triangular number (129795 = T₅₀₉).

The spelling of 128928867 in words is "one hundred twenty-eight million, nine hundred twenty-eight thousand, eight hundred sixty-seven".