72387013 has 2 divisors, whose sum is σ = 72387014. Its totient is φ = 72387012.

The previous prime is 72386939. The next prime is 72387043. The reversal of 72387013 is 31078327.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 59876644 + 12510369 = 7738^2 + 3537^2 .

It is a cyclic number.

It is not a de Polignac number, because 72387013 - 2²¹ = 70289861 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (72387043) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36193506 + 36193507.

It is an arithmetic number, because the mean of its divisors is an integer number (36193507).

Almost surely, 2^72387013 is an apocalyptic number.

It is an amenable number.

72387013 is a deficient number, since it is larger than the sum of its proper divisors (1).

72387013 is an equidigital number, since it uses as much as digits as its factorization.

72387013 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7056, while the sum is 31.

The square root of 72387013 is about 8508.0557708562. The cubic root of 72387013 is about 416.7608214599.

The spelling of 72387013 in words is "seventy-two million, three hundred eighty-seven thousand, thirteen".