72659169 has 18 divisors (see below), whose sum is σ = 115362338. Its totient is φ = 44035200.

The previous prime is 72659159. The next prime is 72659203. The reversal of 72659169 is 96195627.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 60652944 + 12006225 = 7788^2 + 3465^2 .

It is not a de Polignac number, because 72659169 - 2²⁰ = 71610593 is a prime.

It is a super-2 number, since 2×72659169² = 10558709679541122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72659159) 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 17 ways as a sum of consecutive naturals, for example, 32272 + ... + 34449.

Almost surely, 2^72659169 is an apocalyptic number.

It is an amenable number.

72659169 is a deficient number, since it is larger than the sum of its proper divisors (42703169).

72659169 is a wasteful number, since it uses less digits than its factorization.

72659169 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66749 (or 66735 counting only the distinct ones).

The product of its digits is 204120, while the sum is 45.

The square root of 72659169 is about 8524.0347840679. The cubic root of 72659169 is about 417.2824716914.

It can be divided in two parts, 726 and 59169, that added together give a palindrome (59895).

The spelling of 72659169 in words is "seventy-two million, six hundred fifty-nine thousand, one hundred sixty-nine".