72168857 has 2 divisors, whose sum is σ = 72168858. Its totient is φ = 72168856.

The previous prime is 72168823. The next prime is 72168869. The reversal of 72168857 is 75886127.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 68823616 + 3345241 = 8296^2 + 1829^2 .

It is a cyclic number.

It is not a de Polignac number, because 72168857 - 2⁶ = 72168793 is a prime.

It is a weakly prime.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36084428 + 36084429.

It is an arithmetic number, because the mean of its divisors is an integer number (36084429).

Almost surely, 2^72168857 is an apocalyptic number.

It is an amenable number.

72168857 is a deficient number, since it is larger than the sum of its proper divisors (1).

72168857 is an equidigital number, since it uses as much as digits as its factorization.

72168857 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 188160, while the sum is 44.

The square root of 72168857 is about 8495.2255414439. The cubic root of 72168857 is about 416.3417298823.

The spelling of 72168857 in words is "seventy-two million, one hundred sixty-eight thousand, eight hundred fifty-seven".