72239591 has 4 divisors (see below), whose sum is σ = 72260112. Its totient is φ = 72219072.

The previous prime is 72239569. The next prime is 72239597. The reversal of 72239591 is 19593227.

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 72239591 - 2¹⁰ = 72238567 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72239597) 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, 3491 + ... + 12516.

It is an arithmetic number, because the mean of its divisors is an integer number (18065028).

Almost surely, 2^72239591 is an apocalyptic number.

72239591 is a deficient number, since it is larger than the sum of its proper divisors (20521).

72239591 is a wasteful number, since it uses less digits than its factorization.

72239591 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20520.

The product of its digits is 34020, while the sum is 38.

The square root of 72239591 is about 8499.3876838276. The cubic root of 72239591 is about 416.4777068168.

The spelling of 72239591 in words is "seventy-two million, two hundred thirty-nine thousand, five hundred ninety-one".