72136739 has 4 divisors (see below), whose sum is σ = 72280656. Its totient is φ = 71992824.

The previous prime is 72136733. The next prime is 72136747. The reversal of 72136739 is 93763127.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 93763127 = 31 ⋅3024617.

It is a cyclic number.

It is not a de Polignac number, because 72136739 - 2⁴ = 72136723 is a prime.

It is a super-2 number, since 2×72136739² = 10407418227108242, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72136733) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 71204 + ... + 72209.

It is an arithmetic number, because the mean of its divisors is an integer number (18070164).

Almost surely, 2^72136739 is an apocalyptic number.

72136739 is a deficient number, since it is larger than the sum of its proper divisors (143917).

72136739 is a wasteful number, since it uses less digits than its factorization.

72136739 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 143916.

The product of its digits is 47628, while the sum is 38.

The square root of 72136739 is about 8493.3349751437. The cubic root of 72136739 is about 416.2799578639.

The spelling of 72136739 in words is "seventy-two million, one hundred thirty-six thousand, seven hundred thirty-nine".