72356857 has 2 divisors, whose sum is σ = 72356858. Its totient is φ = 72356856.

The previous prime is 72356839. The next prime is 72356861. The reversal of 72356857 is 75865327.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 52142841 + 20214016 = 7221^2 + 4496^2 .

It is a cyclic number.

It is not a de Polignac number, because 72356857 - 2¹¹ = 72354809 is a prime.

It is not a weakly prime, because it can be changed into another prime (72356887) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36178428 + 36178429.

It is an arithmetic number, because the mean of its divisors is an integer number (36178429).

Almost surely, 2^72356857 is an apocalyptic number.

It is an amenable number.

72356857 is a deficient number, since it is larger than the sum of its proper divisors (1).

72356857 is an equidigital number, since it uses as much as digits as its factorization.

72356857 is an evil number, because the sum of its binary digits is even.

The product of its digits is 352800, while the sum is 43.

The square root of 72356857 is about 8506.2833834760. The cubic root of 72356857 is about 416.7029400599.

The spelling of 72356857 in words is "seventy-two million, three hundred fifty-six thousand, eight hundred fifty-seven".