72188533 has 4 divisors (see below), whose sum is σ = 72385600. Its totient is φ = 71991468.

The previous prime is 72188527. The next prime is 72188549. The reversal of 72188533 is 33588127.

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 72188533 - 2¹³ = 72180341 is a prime.

It is a super-2 number, since 2×72188533² = 10422368593384178, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 72188492 and 72188501.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72188593) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 97983 + ... + 98716.

It is an arithmetic number, because the mean of its divisors is an integer number (18096400).

Almost surely, 2^72188533 is an apocalyptic number.

It is an amenable number.

72188533 is a deficient number, since it is larger than the sum of its proper divisors (197067).

72188533 is a wasteful number, since it uses less digits than its factorization.

72188533 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 197066.

The product of its digits is 40320, while the sum is 37.

The square root of 72188533 is about 8496.3835247710. The cubic root of 72188533 is about 416.3795633553.

It can be divided in two parts, 7218 and 8533, that added together give a palindrome (15751).

The spelling of 72188533 in words is "seventy-two million, one hundred eighty-eight thousand, five hundred thirty-three".