72878669 has 2 divisors, whose sum is σ = 72878670. Its totient is φ = 72878668.

The previous prime is 72878579. The next prime is 72878681. The reversal of 72878669 is 96687827.

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., 36457444 + 36421225 = 6038^2 + 6035^2 .

It is a cyclic number.

It is not a de Polignac number, because 72878669 - 2¹² = 72874573 is a prime.

It is a super-2 number, since 2×72878669² = 10622600790423122, 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 72878669.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (72872669) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36439334 + 36439335.

It is an arithmetic number, because the mean of its divisors is an integer number (36439335).

Almost surely, 2^72878669 is an apocalyptic number.

It is an amenable number.

72878669 is a deficient number, since it is larger than the sum of its proper divisors (1).

72878669 is an equidigital number, since it uses as much as digits as its factorization.

72878669 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 72878669 is about 8536.9004328269. The cubic root of 72878669 is about 417.7022463050.

It can be divided in two parts, 728 and 78669, that added together give a palindrome (79397).

The spelling of 72878669 in words is "seventy-two million, eight hundred seventy-eight thousand, six hundred sixty-nine".