72520537 has 2 divisors, whose sum is σ = 72520538. Its totient is φ = 72520536.

The previous prime is 72520529. The next prime is 72520543. The reversal of 72520537 is 73502527.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 36772096 + 35748441 = 6064^2 + 5979^2 .

It is a cyclic number.

It is not a de Polignac number, because 72520537 - 2³ = 72520529 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 72520499 and 72520508.

It is not a weakly prime, because it can be changed into another prime (72520507) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36260268 + 36260269.

It is an arithmetic number, because the mean of its divisors is an integer number (36260269).

Almost surely, 2^72520537 is an apocalyptic number.

It is an amenable number.

72520537 is a deficient number, since it is larger than the sum of its proper divisors (1).

72520537 is an equidigital number, since it uses as much as digits as its factorization.

72520537 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 14700, while the sum is 31.

The square root of 72520537 is about 8515.8990717363. The cubic root of 72520537 is about 417.0169143191.

The spelling of 72520537 in words is "seventy-two million, five hundred twenty thousand, five hundred thirty-seven".