72743569 has 2 divisors, whose sum is σ = 72743570. Its totient is φ = 72743568.

The previous prime is 72743563. The next prime is 72743581. The reversal of 72743569 is 96534727.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 63361600 + 9381969 = 7960^2 + 3063^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-72743569 is a prime.

It is a super-2 number, since 2×72743569² = 10583253661715522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (72743563) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36371784 + 36371785.

It is an arithmetic number, because the mean of its divisors is an integer number (36371785).

Almost surely, 2^72743569 is an apocalyptic number.

It is an amenable number.

72743569 is a deficient number, since it is larger than the sum of its proper divisors (1).

72743569 is an equidigital number, since it uses as much as digits as its factorization.

72743569 is an evil number, because the sum of its binary digits is even.

The product of its digits is 317520, while the sum is 43.

The square root of 72743569 is about 8528.9840543877. The cubic root of 72743569 is about 417.4439792404.

The spelling of 72743569 in words is "seventy-two million, seven hundred forty-three thousand, five hundred sixty-nine".