172090404 has 36 divisors (see below), whose sum is σ = 446766684. Its totient is φ = 55812672.

The previous prime is 172090363. The next prime is 172090409. The reversal of 172090404 is 404090271.

It is a happy number.

172090404 is a `hidden beast` number, since 172 + 0 + 90 + 404 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 145154304 + 26936100 = 12048^2 + 5190^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is not an unprimeable number, because it can be changed into a prime (172090409) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 63267 + ... + 65930.

Almost surely, 2^172090404 is an apocalyptic number.

It is an amenable number.

172090404 is an abundant number, since it is smaller than the sum of its proper divisors (274676280).

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

172090404 is a wasteful number, since it uses less digits than its factorization.

172090404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 129244 (or 129239 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 27.

The square root of 172090404 is about 13118.3232160212. The cubic root of 172090404 is about 556.2271943855.

The spelling of 172090404 in words is "one hundred seventy-two million, ninety thousand, four hundred four".