172505780 has 12 divisors (see below), whose sum is σ = 362262180. Its totient is φ = 69002304.

The previous prime is 172505779. The next prime is 172505821. The reversal of 172505780 is 87505271.

172505780 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 108409744 + 64096036 = 10412^2 + 8006^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 172505780.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4312625 + ... + 4312664.

It is an arithmetic number, because the mean of its divisors is an integer number (30188515).

Almost surely, 2^172505780 is an apocalyptic number.

172505780 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

172505780 is an abundant number, since it is smaller than the sum of its proper divisors (189756400).

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

172505780 is a wasteful number, since it uses less digits than its factorization.

172505780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8625298 (or 8625296 counting only the distinct ones).

The product of its (nonzero) digits is 19600, while the sum is 35.

The square root of 172505780 is about 13134.1455755599. The cubic root of 172505780 is about 556.6743581632.

The spelling of 172505780 in words is "one hundred seventy-two million, five hundred five thousand, seven hundred eighty".