172864679 has 16 divisors (see below), whose sum is σ = 202725600. Its totient is φ = 145950336.

The previous prime is 172864673. The next prime is 172864691. The reversal of 172864679 is 976468271.

It is a cyclic number.

It is not a de Polignac number, because 172864679 - 2²⁰ = 171816103 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (172864673) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4904 + ... + 19229.

It is an arithmetic number, because the mean of its divisors is an integer number (12670350).

Almost surely, 2^172864679 is an apocalyptic number.

172864679 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

172864679 is a deficient number, since it is larger than the sum of its proper divisors (29860921).

172864679 is a wasteful number, since it uses less digits than its factorization.

172864679 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24194.

The product of its digits is 1016064, while the sum is 50.

The square root of 172864679 is about 13147.8012990766. The cubic root of 172864679 is about 557.0601451899.

The spelling of 172864679 in words is "one hundred seventy-two million, eight hundred sixty-four thousand, six hundred seventy-nine".