72708917 has 2 divisors, whose sum is σ = 72708918. Its totient is φ = 72708916.

The previous prime is 72708907. The next prime is 72708929. The reversal of 72708917 is 71980727.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 60078001 + 12630916 = 7751^2 + 3554^2 .

It is a cyclic number.

It is not a de Polignac number, because 72708917 - 2⁸ = 72708661 is a prime.

It is a super-2 number, since 2×72708917² = 10573173222625778, which contains 22 as substring.

It is equal to p_4267949 and since 72708917 and 4267949 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (72708907) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36354458 + 36354459.

It is an arithmetic number, because the mean of its divisors is an integer number (36354459).

Almost surely, 2^72708917 is an apocalyptic number.

It is an amenable number.

72708917 is a deficient number, since it is larger than the sum of its proper divisors (1).

72708917 is an equidigital number, since it uses as much as digits as its factorization.

72708917 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 49392, while the sum is 41.

The square root of 72708917 is about 8526.9523864039. The cubic root of 72708917 is about 417.3776844167.

The spelling of 72708917 in words is "seventy-two million, seven hundred eight thousand, nine hundred seventeen".