72515507 has 4 divisors (see below), whose sum is σ = 73597896. Its totient is φ = 71433120.

The previous prime is 72515483. The next prime is 72515537. The reversal of 72515507 is 70551527.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 70551527 = 1783 ⋅39569.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-72515507 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72515537) 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, 541094 + ... + 541227.

It is an arithmetic number, because the mean of its divisors is an integer number (18399474).

Almost surely, 2^72515507 is an apocalyptic number.

72515507 is a deficient number, since it is larger than the sum of its proper divisors (1082389).

72515507 is a wasteful number, since it uses less digits than its factorization.

72515507 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1082388.

The product of its (nonzero) digits is 12250, while the sum is 32.

The square root of 72515507 is about 8515.6037366707. The cubic root of 72515507 is about 417.0072727120.

The spelling of 72515507 in words is "seventy-two million, five hundred fifteen thousand, five hundred seven".