78073769 has 2 divisors, whose sum is σ = 78073770. Its totient is φ = 78073768.

The previous prime is 78073759. The next prime is 78073777. The reversal of 78073769 is 96737087.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 47955625 + 30118144 = 6925^2 + 5488^2 .

It is a cyclic number.

It is not a de Polignac number, because 78073769 - 2²⁴ = 61296553 is a prime.

It is a super-2 number, since 2×78073769² = 12191026811730722, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (78073729) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39036884 + 39036885.

It is an arithmetic number, because the mean of its divisors is an integer number (39036885).

Almost surely, 2^78073769 is an apocalyptic number.

It is an amenable number.

78073769 is a deficient number, since it is larger than the sum of its proper divisors (1).

78073769 is an equidigital number, since it uses as much as digits as its factorization.

78073769 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 444528, while the sum is 47.

The square root of 78073769 is about 8835.9362265693. The cubic root of 78073769 is about 427.4005222066.

The spelling of 78073769 in words is "seventy-eight million, seventy-three thousand, seven hundred sixty-nine".