72913669 has 2 divisors, whose sum is σ = 72913670. Its totient is φ = 72913668.

The previous prime is 72913661. The next prime is 72913679. The reversal of 72913669 is 96631927.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 72080100 + 833569 = 8490^2 + 913^2 .

It is a cyclic number.

It is not a de Polignac number, because 72913669 - 2³ = 72913661 is a prime.

It is a super-2 number, since 2×72913669² = 10632806254083122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (72913661) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36456834 + 36456835.

It is an arithmetic number, because the mean of its divisors is an integer number (36456835).

Almost surely, 2^72913669 is an apocalyptic number.

It is an amenable number.

72913669 is a deficient number, since it is larger than the sum of its proper divisors (1).

72913669 is an equidigital number, since it uses as much as digits as its factorization.

72913669 is an evil number, because the sum of its binary digits is even.

The product of its digits is 122472, while the sum is 43.

The square root of 72913669 is about 8538.9501111085. The cubic root of 72913669 is about 417.7691028082.

The spelling of 72913669 in words is "seventy-two million, nine hundred thirteen thousand, six hundred sixty-nine".