72188162 has 4 divisors (see below), whose sum is σ = 108282246. Its totient is φ = 36094080.

The previous prime is 72188161. The next prime is 72188189. The reversal of 72188162 is 26188127.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 26188127 = 7 ⋅3741161.

It can be written as a sum of positive squares in only one way, i.e., 67387681 + 4800481 = 8209^2 + 2191^2 .

It is a super-2 number, since 2×72188162² = 10422261465876488, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (72188161) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 18047039 + ... + 18047042.

Almost surely, 2^72188162 is an apocalyptic number.

72188162 is a deficient number, since it is larger than the sum of its proper divisors (36094084).

72188162 is a wasteful number, since it uses less digits than its factorization.

72188162 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36094083.

The product of its digits is 10752, while the sum is 35.

The square root of 72188162 is about 8496.3616919244. The cubic root of 72188162 is about 416.3788500514.

Subtracting from 72188162 its sum of digits (35), we obtain a palindrome (72188127).

The spelling of 72188162 in words is "seventy-two million, one hundred eighty-eight thousand, one hundred sixty-two".