172890442888 has 16 divisors (see below), whose sum is σ = 324284049180. Its totient is φ = 86414696448.

The previous prime is 172890442883. The next prime is 172890442897. The reversal of 172890442888 is 888244098271.

It can be written as a sum of positive squares in 2 ways, for example, as 149229235204 + 23661207684 = 386302^2 + 153822^2 .

It is a super-2 number, since 2×172890442888² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (172890442883) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3791545 + ... + 3836872.

Almost surely, 2^172890442888 is an apocalyptic number.

It is an amenable number.

172890442888 is a deficient number, since it is larger than the sum of its proper divisors (151393606292).

172890442888 is a wasteful number, since it uses less digits than its factorization.

172890442888 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7631256 (or 7631252 counting only the distinct ones).

The product of its (nonzero) digits is 16515072, while the sum is 61.

The spelling of 172890442888 in words is "one hundred seventy-two billion, eight hundred ninety million, four hundred forty-two thousand, eight hundred eighty-eight".