72520993 has 4 divisors (see below), whose sum is σ = 72539028. Its totient is φ = 72502960.

The previous prime is 72520979. The next prime is 72521003. The reversal of 72520993 is 39902527.

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

It can be written as a sum of positive squares in 2 ways, for example, as 39538944 + 32982049 = 6288^2 + 5743^2 .

It is a cyclic number.

It is not a de Polignac number, because 72520993 - 2²⁵ = 38966561 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72520913) 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, 63 + ... + 12043.

It is an arithmetic number, because the mean of its divisors is an integer number (18134757).

Almost surely, 2^72520993 is an apocalyptic number.

It is an amenable number.

72520993 is a deficient number, since it is larger than the sum of its proper divisors (18035).

72520993 is a wasteful number, since it uses less digits than its factorization.

72520993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18034.

The product of its (nonzero) digits is 34020, while the sum is 37.

The square root of 72520993 is about 8515.9258451445. The cubic root of 72520993 is about 417.0177883672.

The spelling of 72520993 in words is "seventy-two million, five hundred twenty thousand, nine hundred ninety-three".