172028128488 has 32 divisors (see below), whose sum is σ = 431346514560. Its totient is φ = 57172550400.

The previous prime is 172028128483. The next prime is 172028128567. The reversal of 172028128488 is 884821820271.

It is a super-2 number, since 2×172028128488² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 172028128488.

It is not an unprimeable number, because it can be changed into a prime (172028128483) 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, 10626688 + ... + 10642863.

It is an arithmetic number, because the mean of its divisors is an integer number (13479578580).

Almost surely, 2^172028128488 is an apocalyptic number.

It is an amenable number.

172028128488 is an abundant number, since it is smaller than the sum of its proper divisors (259318386072).

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

172028128488 is a wasteful number, since it uses less digits than its factorization.

172028128488 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21269897 (or 21269893 counting only the distinct ones).

The product of its (nonzero) digits is 917504, while the sum is 51.

The spelling of 172028128488 in words is "one hundred seventy-two billion, twenty-eight million, one hundred twenty-eight thousand, four hundred eighty-eight".