72236491 has 4 divisors (see below), whose sum is σ = 75377232. Its totient is φ = 69095752.

The previous prime is 72236471. The next prime is 72236497. The reversal of 72236491 is 19463227.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 72236491 - 2⁵ = 72236459 is a prime.

It is a super-2 number, since 2×72236491² = 10436221263986162, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72236497) 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, 1570336 + ... + 1570381.

It is an arithmetic number, because the mean of its divisors is an integer number (18844308).

Almost surely, 2^72236491 is an apocalyptic number.

72236491 is a deficient number, since it is larger than the sum of its proper divisors (3140741).

72236491 is a wasteful number, since it uses less digits than its factorization.

72236491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3140740.

The product of its digits is 18144, while the sum is 34.

The square root of 72236491 is about 8499.2053157928. The cubic root of 72236491 is about 416.4717493294.

It can be divided in two parts, 72236 and 491, that added together give a palindrome (72727).

The spelling of 72236491 in words is "seventy-two million, two hundred thirty-six thousand, four hundred ninety-one".