72516247 has 4 divisors (see below), whose sum is σ = 72556720. Its totient is φ = 72475776.

The previous prime is 72516209. The next prime is 72516277. The reversal of 72516247 is 74261527.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 72516247 - 2²³ = 64127639 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 (72516277) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17418 + ... + 21175.

It is an arithmetic number, because the mean of its divisors is an integer number (18139180).

Almost surely, 2^72516247 is an apocalyptic number.

72516247 is a deficient number, since it is larger than the sum of its proper divisors (40473).

72516247 is a wasteful number, since it uses less digits than its factorization.

72516247 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40472.

The product of its digits is 23520, while the sum is 34.

The square root of 72516247 is about 8515.6471862096. The cubic root of 72516247 is about 417.0086911871.

The spelling of 72516247 in words is "seventy-two million, five hundred sixteen thousand, two hundred forty-seven".