128872755 has 32 divisors (see below), whose sum is σ = 249937920. Its totient is φ = 62483040.

The previous prime is 128872753. The next prime is 128872769. The reversal of 128872755 is 557278821.

It is not a de Polignac number, because 128872755 - 2¹ = 128872753 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 128872755.

It is not an unprimeable number, because it can be changed into a prime (128872753) 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, 41907 + ... + 44876.

It is an arithmetic number, because the mean of its divisors is an integer number (7810560).

Almost surely, 2^128872755 is an apocalyptic number.

128872755 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

128872755 is a deficient number, since it is larger than the sum of its proper divisors (121065165).

128872755 is a wasteful number, since it uses less digits than its factorization.

128872755 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86808 (or 86802 counting only the distinct ones).

The product of its digits is 313600, while the sum is 45.

The square root of 128872755 is about 11352.2136607800. The cubic root of 128872755 is about 505.1112456290. Note that the first 3 decimals are identical.

The spelling of 128872755 in words is "one hundred twenty-eight million, eight hundred seventy-two thousand, seven hundred fifty-five".