72717815 has 4 divisors (see below), whose sum is σ = 87261384. Its totient is φ = 58174248.

The previous prime is 72717793. The next prime is 72717829. The reversal of 72717815 is 51871727.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 51871727 = 103 ⋅503609.

It is a cyclic number.

It is not a de Polignac number, because 72717815 - 2⁶ = 72717751 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7271777 + ... + 7271786.

It is an arithmetic number, because the mean of its divisors is an integer number (21815346).

Almost surely, 2^72717815 is an apocalyptic number.

72717815 is a deficient number, since it is larger than the sum of its proper divisors (14543569).

72717815 is a wasteful number, since it uses less digits than its factorization.

72717815 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14543568.

The product of its digits is 27440, while the sum is 38.

The square root of 72717815 is about 8527.4741277825. The cubic root of 72717815 is about 417.3947097248.

It can be divided in two parts, 7271 and 7815, that multiplied together give a palindrome (56822865).

The spelling of 72717815 in words is "seventy-two million, seven hundred seventeen thousand, eight hundred fifteen".