72857249 has 2 divisors, whose sum is σ = 72857250. Its totient is φ = 72857248.

The previous prime is 72857237. The next prime is 72857273. The reversal of 72857249 is 94275827.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 72165025 + 692224 = 8495^2 + 832^2 .

It is a cyclic number.

It is not a de Polignac number, because 72857249 - 2²⁴ = 56080033 is a prime.

It is not a weakly prime, because it can be changed into another prime (72857209) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36428624 + 36428625.

It is an arithmetic number, because the mean of its divisors is an integer number (36428625).

Almost surely, 2^72857249 is an apocalyptic number.

It is an amenable number.

72857249 is a deficient number, since it is larger than the sum of its proper divisors (1).

72857249 is an equidigital number, since it uses as much as digits as its factorization.

72857249 is an evil number, because the sum of its binary digits is even.

The product of its digits is 282240, while the sum is 44.

The square root of 72857249 is about 8535.6457869338. The cubic root of 72857249 is about 417.6613195659.

The spelling of 72857249 in words is "seventy-two million, eight hundred fifty-seven thousand, two hundred forty-nine".