78872669 has 2 divisors, whose sum is σ = 78872670. Its totient is φ = 78872668.

The previous prime is 78872657. The next prime is 78872671. The reversal of 78872669 is 96627887.

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., 54567769 + 24304900 = 7387^2 + 4930^2 .

It is a cyclic number.

It is not a de Polignac number, because 78872669 - 2⁸ = 78872413 is a prime.

It is a super-2 number, since 2×78872669² = 12441795830367122, which contains 22 as substring.

Together with 78872671, it forms a pair of twin primes.

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 78872669.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78872609) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39436334 + 39436335.

It is an arithmetic number, because the mean of its divisors is an integer number (39436335).

Almost surely, 2^78872669 is an apocalyptic number.

It is an amenable number.

78872669 is a deficient number, since it is larger than the sum of its proper divisors (1).

78872669 is an equidigital number, since it uses as much as digits as its factorization.

78872669 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 78872669 is about 8881.0286003368. The cubic root of 78872669 is about 428.8533883557.

The spelling of 78872669 in words is "seventy-eight million, eight hundred seventy-two thousand, six hundred sixty-nine".