72870689 has 2 divisors, whose sum is σ = 72870690. Its totient is φ = 72870688.

The previous prime is 72870683. The next prime is 72870697. The reversal of 72870689 is 98607827.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 47720464 + 25150225 = 6908^2 + 5015^2 .

It is an emirp because it is prime and its reverse (98607827) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-72870689 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (72870683) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36435344 + 36435345.

It is an arithmetic number, because the mean of its divisors is an integer number (36435345).

Almost surely, 2^72870689 is an apocalyptic number.

It is an amenable number.

72870689 is a deficient number, since it is larger than the sum of its proper divisors (1).

72870689 is an equidigital number, since it uses as much as digits as its factorization.

72870689 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 338688, while the sum is 47.

The square root of 72870689 is about 8536.4330372820. The cubic root of 72870689 is about 417.6870000259.

It can be divided in two parts, 728 and 70689, that added together give a palindrome (71417).

The spelling of 72870689 in words is "seventy-two million, eight hundred seventy thousand, six hundred eighty-nine".