172104645 has 16 divisors (see below), whose sum is σ = 275875200. Its totient is φ = 91619904.

The previous prime is 172104643. The next prime is 172104659. The reversal of 172104645 is 546401271.

It is not a de Polignac number, because 172104645 - 2¹ = 172104643 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (172104643) 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, 1945 + ... + 18654.

It is an arithmetic number, because the mean of its divisors is an integer number (17242200).

Almost surely, 2^172104645 is an apocalyptic number.

172104645 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

172104645 is a deficient number, since it is larger than the sum of its proper divisors (103770555).

172104645 is a wasteful number, since it uses less digits than its factorization.

172104645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21164.

The product of its (nonzero) digits is 6720, while the sum is 30.

The square root of 172104645 is about 13118.8659951994. The cubic root of 172104645 is about 556.2425371216.

The spelling of 172104645 in words is "one hundred seventy-two million, one hundred four thousand, six hundred forty-five".