72404169 has 4 divisors (see below), whose sum is σ = 96538896. Its totient is φ = 48269444.

The previous prime is 72404141. The next prime is 72404177. The reversal of 72404169 is 96140427.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 72404169 - 2⁸ = 72403913 is a prime.

It is a super-2 number, since 2×72404169² = 10484727377161122, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (72404179) 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 3 ways as a sum of consecutive naturals, for example, 12067359 + ... + 12067364.

It is an arithmetic number, because the mean of its divisors is an integer number (24134724).

Almost surely, 2^72404169 is an apocalyptic number.

It is an amenable number.

72404169 is a deficient number, since it is larger than the sum of its proper divisors (24134727).

72404169 is a wasteful number, since it uses less digits than its factorization.

72404169 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24134726.

The product of its (nonzero) digits is 12096, while the sum is 33.

The square root of 72404169 is about 8509.0639320668. The cubic root of 72404169 is about 416.7937434974.

The spelling of 72404169 in words is "seventy-two million, four hundred four thousand, one hundred sixty-nine".