72522239 has 4 divisors (see below), whose sum is σ = 72839160. Its totient is φ = 72205320.

The previous prime is 72522227. The next prime is 72522251. The reversal of 72522239 is 93222527.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 93222527 = 67 ⋅1391381.

It is an interprime number because it is at equal distance from previous prime (72522227) and next prime (72522251).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-72522239 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 (72722239) 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, 158117 + ... + 158574.

It is an arithmetic number, because the mean of its divisors is an integer number (18209790).

Almost surely, 2^72522239 is an apocalyptic number.

72522239 is a deficient number, since it is larger than the sum of its proper divisors (316921).

72522239 is a wasteful number, since it uses less digits than its factorization.

72522239 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 316920.

The product of its digits is 15120, while the sum is 32.

The square root of 72522239 is about 8515.9990018788. Note that the first 3 decimals coincide. The cubic root of 72522239 is about 417.0201766466.

The spelling of 72522239 in words is "seventy-two million, five hundred twenty-two thousand, two hundred thirty-nine".