72240085 has 4 divisors (see below), whose sum is σ = 86688108. Its totient is φ = 57792064.

The previous prime is 72240037. The next prime is 72240101. The reversal of 72240085 is 58004227.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 58004227 = 1973 ⋅29399.

It can be written as a sum of positive squares in 2 ways, for example, as 44435556 + 27804529 = 6666^2 + 5273^2 .

It is a cyclic number.

It is not a de Polignac number, because 72240085 - 2¹⁷ = 72109013 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7224004 + ... + 7224013.

It is an arithmetic number, because the mean of its divisors is an integer number (21672027).

Almost surely, 2^72240085 is an apocalyptic number.

It is an amenable number.

72240085 is a deficient number, since it is larger than the sum of its proper divisors (14448023).

72240085 is a wasteful number, since it uses less digits than its factorization.

72240085 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14448022.

The product of its (nonzero) digits is 4480, while the sum is 28.

The square root of 72240085 is about 8499.4167446949. The cubic root of 72240085 is about 416.4786561555.

The spelling of 72240085 in words is "seventy-two million, two hundred forty thousand, eighty-five".