72856493 has 2 divisors, whose sum is σ = 72856494. Its totient is φ = 72856492.

The previous prime is 72856481. The next prime is 72856513. The reversal of 72856493 is 39465827.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 61418569 + 11437924 = 7837^2 + 3382^2 .

It is an emirp because it is prime and its reverse (39465827) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 72856493 - 2⁴ = 72856477 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (72856423) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36428246 + 36428247.

It is an arithmetic number, because the mean of its divisors is an integer number (36428247).

Almost surely, 2^72856493 is an apocalyptic number.

It is an amenable number.

72856493 is a deficient number, since it is larger than the sum of its proper divisors (1).

72856493 is an equidigital number, since it uses as much as digits as its factorization.

72856493 is an evil number, because the sum of its binary digits is even.

The product of its digits is 362880, while the sum is 44.

The square root of 72856493 is about 8535.6015019447. The cubic root of 72856493 is about 417.6598749462.

The spelling of 72856493 in words is "seventy-two million, eight hundred fifty-six thousand, four hundred ninety-three".