72166274 has 8 divisors (see below), whose sum is σ = 108404220. Its totient is φ = 36031536.

The previous prime is 72166271. The next prime is 72166279. The reversal of 72166274 is 47266127.

It can be written as a sum of positive squares in 2 ways, for example, as 50310649 + 21855625 = 7093^2 + 4675^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×72166274² = 10415942206086152, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (72166271) 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, 24029 + ... + 26864.

Almost surely, 2^72166274 is an apocalyptic number.

72166274 is a deficient number, since it is larger than the sum of its proper divisors (36237946).

72166274 is a wasteful number, since it uses less digits than its factorization.

72166274 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51604.

The product of its digits is 28224, while the sum is 35.

The square root of 72166274 is about 8495.0735135136. The cubic root of 72166274 is about 416.3367627188.

The spelling of 72166274 in words is "seventy-two million, one hundred sixty-six thousand, two hundred seventy-four".