72858857 has 2 divisors, whose sum is σ = 72858858. Its totient is φ = 72858856.

The previous prime is 72858829. The next prime is 72858887. The reversal of 72858857 is 75885827.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 50993881 + 21864976 = 7141^2 + 4676^2 .

It is a cyclic number.

It is not a de Polignac number, because 72858857 - 2²⁰ = 71810281 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (72858887) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36429428 + 36429429.

It is an arithmetic number, because the mean of its divisors is an integer number (36429429).

Almost surely, 2^72858857 is an apocalyptic number.

It is an amenable number.

72858857 is a deficient number, since it is larger than the sum of its proper divisors (1).

72858857 is an equidigital number, since it uses as much as digits as its factorization.

72858857 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1254400, while the sum is 50.

The square root of 72858857 is about 8535.7399796386. The cubic root of 72858857 is about 417.6643922158.

The spelling of 72858857 in words is "seventy-two million, eight hundred fifty-eight thousand, eight hundred fifty-seven".