172179144 has 48 divisors (see below), whose sum is σ = 470955420. Its totient is φ = 56822400.

The previous prime is 172179143. The next prime is 172179191. The reversal of 172179144 is 441971271.

It can be written as a sum of positive squares in 2 ways, for example, as 162256644 + 9922500 = 12738^2 + 3150^2 .

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 172179099 and 172179108.

It is not an unprimeable number, because it can be changed into a prime (172179143) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4567 + ... + 19110.

Almost surely, 2^172179144 is an apocalyptic number.

It is an amenable number.

172179144 is an abundant number, since it is smaller than the sum of its proper divisors (298776276).

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

172179144 is a wasteful number, since it uses less digits than its factorization.

172179144 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23790 (or 23783 counting only the distinct ones).

The product of its digits is 14112, while the sum is 36.

The square root of 172179144 is about 13121.7050721314. The cubic root of 172179144 is about 556.3227858464.

The spelling of 172179144 in words is "one hundred seventy-two million, one hundred seventy-nine thousand, one hundred forty-four".