72515751 has 16 divisors (see below), whose sum is σ = 120546048. Its totient is φ = 37670400.

The previous prime is 72515749. The next prime is 72515753. The reversal of 72515751 is 15751527.

It is an interprime number because it is at equal distance from previous prime (72515749) and next prime (72515753).

It is not a de Polignac number, because 72515751 - 2¹ = 72515749 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72515753) 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, 156730 + ... + 157191.

It is an arithmetic number, because the mean of its divisors is an integer number (7534128).

Almost surely, 2^72515751 is an apocalyptic number.

72515751 is a deficient number, since it is larger than the sum of its proper divisors (48030297).

72515751 is a wasteful number, since it uses less digits than its factorization.

72515751 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 313942.

The product of its digits is 12250, while the sum is 33.

The square root of 72515751 is about 8515.6180632999. The cubic root of 72515751 is about 417.0077404265.

The spelling of 72515751 in words is "seventy-two million, five hundred fifteen thousand, seven hundred fifty-one".