72868769 has 2 divisors, whose sum is σ = 72868770. Its totient is φ = 72868768.

The previous prime is 72868751. The next prime is 72868777. The reversal of 72868769 is 96786827.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 57760000 + 15108769 = 7600^2 + 3887^2 .

It is a cyclic number.

It is not a de Polignac number, because 72868769 - 2⁸ = 72868513 is a prime.

It is a super-2 number, since 2×72868769² = 10619714991150722, which contains 22 as substring.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 72868769.

It is not a weakly prime, because it can be changed into another prime (72868729) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36434384 + 36434385.

It is an arithmetic number, because the mean of its divisors is an integer number (36434385).

Almost surely, 2^72868769 is an apocalyptic number.

It is an amenable number.

72868769 is a deficient number, since it is larger than the sum of its proper divisors (1).

72868769 is an equidigital number, since it uses as much as digits as its factorization.

72868769 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2032128, while the sum is 53.

The square root of 72868769 is about 8536.3205773916. The cubic root of 72868769 is about 417.6833315821.

It can be divided in two parts, 72868 and 769, that added together give a palindrome (73637).

The spelling of 72868769 in words is "seventy-two million, eight hundred sixty-eight thousand, seven hundred sixty-nine".