72137279 has 8 divisors (see below), whose sum is σ = 75126912. Its totient is φ = 69189120.

The previous prime is 72137257. The next prime is 72137287. The reversal of 72137279 is 97273127.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 72137279 - 2¹² = 72133183 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 (72133279) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6794 + ... + 13799.

It is an arithmetic number, because the mean of its divisors is an integer number (9390864).

Almost surely, 2^72137279 is an apocalyptic number.

72137279 is a deficient number, since it is larger than the sum of its proper divisors (2989633).

72137279 is a wasteful number, since it uses less digits than its factorization.

72137279 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20737.

The product of its digits is 37044, while the sum is 38.

The square root of 72137279 is about 8493.3667647170. The cubic root of 72137279 is about 416.2809965885.

The spelling of 72137279 in words is "seventy-two million, one hundred thirty-seven thousand, two hundred seventy-nine".