72504139 has 2 divisors, whose sum is σ = 72504140. Its totient is φ = 72504138.

The previous prime is 72504137. The next prime is 72504143. The reversal of 72504139 is 93140527.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 72504139 - 2¹ = 72504137 is a prime.

Together with 72504137, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 72504139.

It is not a weakly prime, because it can be changed into another prime (72504137) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36252069 + 36252070.

It is an arithmetic number, because the mean of its divisors is an integer number (36252070).

Almost surely, 2^72504139 is an apocalyptic number.

72504139 is a deficient number, since it is larger than the sum of its proper divisors (1).

72504139 is an equidigital number, since it uses as much as digits as its factorization.

72504139 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7560, while the sum is 31.

The square root of 72504139 is about 8514.9362299432. The cubic root of 72504139 is about 416.9854806539.

The spelling of 72504139 in words is "seventy-two million, five hundred four thousand, one hundred thirty-nine".