72256537 has 2 divisors, whose sum is σ = 72256538. Its totient is φ = 72256536.

The previous prime is 72256529. The next prime is 72256559. The reversal of 72256537 is 73565227.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 47941776 + 24314761 = 6924^2 + 4931^2 .

It is an emirp because it is prime and its reverse (73565227) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 72256537 - 2³ = 72256529 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 72256496 and 72256505.

It is not a weakly prime, because it can be changed into another prime (72256517) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36128268 + 36128269.

It is an arithmetic number, because the mean of its divisors is an integer number (36128269).

Almost surely, 2^72256537 is an apocalyptic number.

It is an amenable number.

72256537 is a deficient number, since it is larger than the sum of its proper divisors (1).

72256537 is an equidigital number, since it uses as much as digits as its factorization.

72256537 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 88200, while the sum is 37.

The square root of 72256537 is about 8500.3845207143. The cubic root of 72256537 is about 416.5102701214.

The spelling of 72256537 in words is "seventy-two million, two hundred fifty-six thousand, five hundred thirty-seven".