72742279 has 16 divisors (see below), whose sum is σ = 78220800. Its totient is φ = 67447296.

The previous prime is 72742253. The next prime is 72742289. The reversal of 72742279 is 97224727.

It is a cyclic number.

It is not a de Polignac number, because 72742279 - 2¹¹ = 72740231 is a prime.

It is a super-2 number, since 2×72742279² = 10582878308227682, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72742249) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 304242 + ... + 304480.

It is an arithmetic number, because the mean of its divisors is an integer number (4888800).

Almost surely, 2^72742279 is an apocalyptic number.

72742279 is a deficient number, since it is larger than the sum of its proper divisors (5478521).

72742279 is a wasteful number, since it uses less digits than its factorization.

72742279 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 534.

The product of its digits is 98784, while the sum is 40.

The square root of 72742279 is about 8528.9084295706. The cubic root of 72742279 is about 417.4415116412.

The spelling of 72742279 in words is "seventy-two million, seven hundred forty-two thousand, two hundred seventy-nine".