72542273 has 4 divisors (see below), whose sum is σ = 73113600. Its totient is φ = 71970948.

The previous prime is 72542269. The next prime is 72542317. The reversal of 72542273 is 37224527.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 37224527 = 479 ⋅77713.

It is a cyclic number.

It is not a de Polignac number, because 72542273 - 2² = 72542269 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72542233) 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, 285473 + ... + 285726.

It is an arithmetic number, because the mean of its divisors is an integer number (18278400).

Almost surely, 2^72542273 is an apocalyptic number.

It is an amenable number.

72542273 is a deficient number, since it is larger than the sum of its proper divisors (571327).

72542273 is a wasteful number, since it uses less digits than its factorization.

72542273 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 571326.

The product of its digits is 23520, while the sum is 32.

The square root of 72542273 is about 8517.1751772521. The cubic root of 72542273 is about 417.0585732044.

The spelling of 72542273 in words is "seventy-two million, five hundred forty-two thousand, two hundred seventy-three".