172541636 has 24 divisors (see below), whose sum is σ = 322060536. Its totient is φ = 80599040.

The previous prime is 172541627. The next prime is 172541639. The reversal of 172541636 is 636145271.

It can be written as a sum of positive squares in 4 ways, for example, as 112572100 + 59969536 = 10610^2 + 7744^2 .

It is a junction number, because it is equal to n+sod(n) for n = 172541596 and 172541605.

It is not an unprimeable number, because it can be changed into a prime (172541639) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 56 + ... + 18576.

It is an arithmetic number, because the mean of its divisors is an integer number (13419189).

Almost surely, 2^172541636 is an apocalyptic number.

It is an amenable number.

172541636 is a deficient number, since it is larger than the sum of its proper divisors (149518900).

172541636 is a wasteful number, since it uses less digits than its factorization.

172541636 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18679 (or 18677 counting only the distinct ones).

The product of its digits is 30240, while the sum is 35.

The square root of 172541636 is about 13135.5104963606. The cubic root of 172541636 is about 556.7129244710.

The spelling of 172541636 in words is "one hundred seventy-two million, five hundred forty-one thousand, six hundred thirty-six".