172028128475 has 96 divisors (see below), whose sum is σ = 272720401920. Its totient is φ = 104790620160.

The previous prime is 172028128471. The next prime is 172028128483. The reversal of 172028128475 is 574821820271.

It is not a de Polignac number, because 172028128475 - 2² = 172028128471 is a prime.

It is a super-2 number, since 2×172028128475² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (172028128471) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 15651932 + ... + 15662918.

It is an arithmetic number, because the mean of its divisors is an integer number (2840837520).

Almost surely, 2^172028128475 is an apocalyptic number.

172028128475 is a deficient number, since it is larger than the sum of its proper divisors (100692273445).

172028128475 is a wasteful number, since it uses less digits than its factorization.

172028128475 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11317 (or 11312 counting only the distinct ones).

The product of its (nonzero) digits is 501760, while the sum is 47.

The spelling of 172028128475 in words is "one hundred seventy-two billion, twenty-eight million, one hundred twenty-eight thousand, four hundred seventy-five".