72649613 has 2 divisors, whose sum is σ = 72649614. Its totient is φ = 72649612.

The previous prime is 72649607. The next prime is 72649627. The reversal of 72649613 is 31694627.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 56505289 + 16144324 = 7517^2 + 4018^2 .

72649613 is a truncatable prime.

It is an emirp because it is prime and its reverse (31694627) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 72649613 - 2¹⁴ = 72633229 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (72649693) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36324806 + 36324807.

It is an arithmetic number, because the mean of its divisors is an integer number (36324807).

Almost surely, 2^72649613 is an apocalyptic number.

It is an amenable number.

72649613 is a deficient number, since it is larger than the sum of its proper divisors (1).

72649613 is an equidigital number, since it uses as much as digits as its factorization.

72649613 is an evil number, because the sum of its binary digits is even.

The product of its digits is 54432, while the sum is 38.

The square root of 72649613 is about 8523.4742329639. The cubic root of 72649613 is about 417.2641774822.

The spelling of 72649613 in words is "seventy-two million, six hundred forty-nine thousand, six hundred thirteen".