172130805 has 128 divisors (see below), whose sum is σ = 395366400. Its totient is φ = 68947200.

The previous prime is 172130759. The next prime is 172130843. The reversal of 172130805 is 508031271.

It is not a de Polignac number, because 172130805 - 2¹⁰ = 172129781 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 301170 + ... + 301740.

It is an arithmetic number, because the mean of its divisors is an integer number (3088800).

Almost surely, 2^172130805 is an apocalyptic number.

172130805 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

172130805 is an abundant number, since it is smaller than the sum of its proper divisors (223235595).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

172130805 is a wasteful number, since it uses less digits than its factorization.

172130805 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 632 (or 626 counting only the distinct ones).

The product of its (nonzero) digits is 1680, while the sum is 27.

The square root of 172130805 is about 13119.8629947115. The cubic root of 172130805 is about 556.2707187502.

The spelling of 172130805 in words is "one hundred seventy-two million, one hundred thirty thousand, eight hundred five".