72540717 has 8 divisors (see below), whose sum is σ = 102410496. Its totient is φ = 45515712.

The previous prime is 72540709. The next prime is 72540731. The reversal of 72540717 is 71704527.

It is a happy number.

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

It is not a de Polignac number, because 72540717 - 2³ = 72540709 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72540817) 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, 711133 + ... + 711234.

It is an arithmetic number, because the mean of its divisors is an integer number (12801312).

Almost surely, 2^72540717 is an apocalyptic number.

It is an amenable number.

72540717 is a deficient number, since it is larger than the sum of its proper divisors (29869779).

72540717 is a wasteful number, since it uses less digits than its factorization.

72540717 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1422387.

The product of its (nonzero) digits is 13720, while the sum is 33.

The square root of 72540717 is about 8517.0838319228. The cubic root of 72540717 is about 417.0555912752.

The spelling of 72540717 in words is "seventy-two million, five hundred forty thousand, seven hundred seventeen".