72740839 has 4 divisors (see below), whose sum is σ = 72774856. Its totient is φ = 72706824.

The previous prime is 72740831. The next prime is 72740851. The reversal of 72740839 is 93804727.

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 72740839 - 2³ = 72740831 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 (72740831) 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, 13569 + ... + 18154.

It is an arithmetic number, because the mean of its divisors is an integer number (18193714).

Almost surely, 2^72740839 is an apocalyptic number.

72740839 is a deficient number, since it is larger than the sum of its proper divisors (34017).

72740839 is a wasteful number, since it uses less digits than its factorization.

72740839 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34016.

The product of its (nonzero) digits is 84672, while the sum is 40.

The square root of 72740839 is about 8528.8240103780. The cubic root of 72740839 is about 417.4387570774.

The spelling of 72740839 in words is "seventy-two million, seven hundred forty thousand, eight hundred thirty-nine".