72457117 has 2 divisors, whose sum is σ = 72457118. Its totient is φ = 72457116.

The previous prime is 72457067. The next prime is 72457123. The reversal of 72457117 is 71175427.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 60388441 + 12068676 = 7771^2 + 3474^2 .

It is a cyclic number.

It is not a de Polignac number, because 72457117 - 2¹¹ = 72455069 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (72457717) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36228558 + 36228559.

It is an arithmetic number, because the mean of its divisors is an integer number (36228559).

Almost surely, 2^72457117 is an apocalyptic number.

It is an amenable number.

72457117 is a deficient number, since it is larger than the sum of its proper divisors (1).

72457117 is an equidigital number, since it uses as much as digits as its factorization.

72457117 is an evil number, because the sum of its binary digits is even.

The product of its digits is 13720, while the sum is 34.

The square root of 72457117 is about 8512.1746340169. The cubic root of 72457117 is about 416.8953169206.

The spelling of 72457117 in words is "seventy-two million, four hundred fifty-seven thousand, one hundred seventeen".