72651617 has 2 divisors, whose sum is σ = 72651618. Its totient is φ = 72651616.

The previous prime is 72651563. The next prime is 72651629. The reversal of 72651617 is 71615627.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 70040161 + 2611456 = 8369^2 + 1616^2 .

It is a cyclic number.

It is not a de Polignac number, because 72651617 - 2¹² = 72647521 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (72651637) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36325808 + 36325809.

It is an arithmetic number, because the mean of its divisors is an integer number (36325809).

Almost surely, 2^72651617 is an apocalyptic number.

It is an amenable number.

72651617 is a deficient number, since it is larger than the sum of its proper divisors (1).

72651617 is an equidigital number, since it uses as much as digits as its factorization.

72651617 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 17640, while the sum is 35.

The square root of 72651617 is about 8523.5917898501. The cubic root of 72651617 is about 417.2680141152.

The spelling of 72651617 in words is "seventy-two million, six hundred fifty-one thousand, six hundred seventeen".