72856247 has 2 divisors, whose sum is σ = 72856248. Its totient is φ = 72856246.

The previous prime is 72856213. The next prime is 72856253. The reversal of 72856247 is 74265827.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 72856247 - 2¹⁸ = 72594103 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (72856297) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36428123 + 36428124.

It is an arithmetic number, because the mean of its divisors is an integer number (36428124).

Almost surely, 2^72856247 is an apocalyptic number.

72856247 is a deficient number, since it is larger than the sum of its proper divisors (1).

72856247 is an equidigital number, since it uses as much as digits as its factorization.

72856247 is an evil number, because the sum of its binary digits is even.

The product of its digits is 188160, while the sum is 41.

The square root of 72856247 is about 8535.5870917003. The cubic root of 72856247 is about 417.6594048694.

The spelling of 72856247 in words is "seventy-two million, eight hundred fifty-six thousand, two hundred forty-seven".