72739213 has 2 divisors, whose sum is σ = 72739214. Its totient is φ = 72739212.

The previous prime is 72739211. The next prime is 72739223. The reversal of 72739213 is 31293727.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 71961289 + 777924 = 8483^2 + 882^2 .

It is an emirp because it is prime and its reverse (31293727) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 72739213 - 2¹ = 72739211 is a prime.

Together with 72739211, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (72739211) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36369606 + 36369607.

It is an arithmetic number, because the mean of its divisors is an integer number (36369607).

Almost surely, 2^72739213 is an apocalyptic number.

It is an amenable number.

72739213 is a deficient number, since it is larger than the sum of its proper divisors (1).

72739213 is an equidigital number, since it uses as much as digits as its factorization.

72739213 is an evil number, because the sum of its binary digits is even.

The product of its digits is 15876, while the sum is 34.

The square root of 72739213 is about 8528.7286860352. The cubic root of 72739213 is about 417.4356466721.

The spelling of 72739213 in words is "seventy-two million, seven hundred thirty-nine thousand, two hundred thirteen".