72738239 has 4 divisors (see below), whose sum is σ = 83129424. Its totient is φ = 62347056.

The previous prime is 72738229. The next prime is 72738269. The reversal of 72738239 is 93283727.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 93283727 = 43 ⋅2169389.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-72738239 is a prime.

It is a super-2 number, since 2×72738239² = 10581702825642242, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 72738196 and 72738205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72738229) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5195582 + ... + 5195595.

It is an arithmetic number, because the mean of its divisors is an integer number (20782356).

Almost surely, 2^72738239 is an apocalyptic number.

72738239 is a deficient number, since it is larger than the sum of its proper divisors (10391185).

72738239 is a wasteful number, since it uses less digits than its factorization.

72738239 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10391184.

The product of its digits is 127008, while the sum is 41.

The square root of 72738239 is about 8528.6715847194. The cubic root of 72738239 is about 417.4337834674.

The spelling of 72738239 in words is "seventy-two million, seven hundred thirty-eight thousand, two hundred thirty-nine".