72404172 has 24 divisors (see below), whose sum is σ = 187714800. Its totient is φ = 24134688.

The previous prime is 72404141. The next prime is 72404177. The reversal of 72404172 is 27140427.

It is a happy number.

72404172 is a `hidden beast` number, since 7 + 240 + 417 + 2 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (72404177) 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, 335097 + ... + 335312.

It is an arithmetic number, because the mean of its divisors is an integer number (7821450).

Almost surely, 2^72404172 is an apocalyptic number.

It is an amenable number.

72404172 is an abundant number, since it is smaller than the sum of its proper divisors (115310628).

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

72404172 is a wasteful number, since it uses less digits than its factorization.

72404172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 670422 (or 670414 counting only the distinct ones).

The product of its (nonzero) digits is 3136, while the sum is 27.

The square root of 72404172 is about 8509.0641083494. The cubic root of 72404172 is about 416.7937492539.

Adding to 72404172 its reverse (27140427), we get a palindrome (99544599).

The spelling of 72404172 in words is "seventy-two million, four hundred four thousand, one hundred seventy-two".