72697172 has 6 divisors (see below), whose sum is σ = 127220058. Its totient is φ = 36348584.

The previous prime is 72697129. The next prime is 72697187. The reversal of 72697172 is 27179627.

72697172 is nontrivially palindromic in base 8 and base 16.

It can be written as a sum of positive squares in only one way, i.e., 38987536 + 33709636 = 6244^2 + 5806^2 .

It is a congruent number.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 9087143 + ... + 9087150.

It is an arithmetic number, because the mean of its divisors is an integer number (21203343).

Almost surely, 2^72697172 is an apocalyptic number.

It is an amenable number.

72697172 is a deficient number, since it is larger than the sum of its proper divisors (54522886).

72697172 is a wasteful number, since it uses less digits than its factorization.

72697172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18174297 (or 18174295 counting only the distinct ones).

The product of its digits is 74088, while the sum is 41.

The square root of 72697172 is about 8526.2636600096. The cubic root of 72697172 is about 417.3552095718.

It can be divided in two parts, 7269 and 7172, that added together give a palindrome (14441).

The spelling of 72697172 in words is "seventy-two million, six hundred ninety-seven thousand, one hundred seventy-two".