172890428889 has 8 divisors (see below), whose sum is σ = 236143024992. Its totient is φ = 112449059360.

The previous prime is 172890428863. The next prime is 172890428939. The reversal of 172890428889 is 988824098271.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 172890428889 - 2⁷ = 172890428761 is a prime.

It is a super-2 number, since 2×172890428889² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (172890428819) 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, 702806499 + ... + 702806744.

It is an arithmetic number, because the mean of its divisors is an integer number (29517878124).

Almost surely, 2^172890428889 is an apocalyptic number.

It is an amenable number.

172890428889 is a deficient number, since it is larger than the sum of its proper divisors (63252596103).

172890428889 is a wasteful number, since it uses less digits than its factorization.

172890428889 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1405613287.

The product of its (nonzero) digits is 37158912, while the sum is 66.

The spelling of 172890428889 in words is "one hundred seventy-two billion, eight hundred ninety million, four hundred twenty-eight thousand, eight hundred eighty-nine".