172076805 has 56 divisors (see below), whose sum is σ = 327926232. Its totient is φ = 86344704.

The previous prime is 172076789. The next prime is 172076809. The reversal of 172076805 is 508670271.

It can be written as a sum of positive squares in 4 ways, for example, as 13089924 + 158986881 = 3618^2 + 12609^2 .

It is not a de Polignac number, because 172076805 - 2⁴ = 172076789 is a prime.

It is a super-2 number, since 2×172076805² = 59220853638016050, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 172076805.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (172076809) by changing a digit.

It is a polite number, since it can be written in 55 ways as a sum of consecutive naturals, for example, 60577 + ... + 63353.

Almost surely, 2^172076805 is an apocalyptic number.

172076805 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

172076805 is a deficient number, since it is larger than the sum of its proper divisors (155849427).

172076805 is an equidigital number, since it uses as much as digits as its factorization.

172076805 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2817 (or 2802 counting only the distinct ones).

The product of its (nonzero) digits is 23520, while the sum is 36.

The square root of 172076805 is about 13117.8048849646. The cubic root of 172076805 is about 556.2125425267.

The spelling of 172076805 in words is "one hundred seventy-two million, seventy-six thousand, eight hundred five".