172890827 has 6 divisors (see below), whose sum is σ = 175874388. Its totient is φ = 169957052.

The previous prime is 172890821. The next prime is 172890847. The reversal of 172890827 is 728098271.

172890827 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 172890827 - 2¹⁰ = 172889803 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (172890821) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 21353 + ... + 28314.

It is an arithmetic number, because the mean of its divisors is an integer number (29312398).

Almost surely, 2^172890827 is an apocalyptic number.

172890827 is a deficient number, since it is larger than the sum of its proper divisors (2983561).

172890827 is an frugal number, since it uses more digits than its factorization.

172890827 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49785 (or 49726 counting only the distinct ones).

The product of its (nonzero) digits is 112896, while the sum is 44.

The square root of 172890827 is about 13148.7956482714. The cubic root of 172890827 is about 557.0882312712.

The spelling of 172890827 in words is "one hundred seventy-two million, eight hundred ninety thousand, eight hundred twenty-seven".