78869677 has 2 divisors, whose sum is σ = 78869678. Its totient is φ = 78869676.

The previous prime is 78869657. The next prime is 78869683. The reversal of 78869677 is 77696887.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 78747876 + 121801 = 8874^2 + 349^2 .

It is a cyclic number.

It is not a de Polignac number, because 78869677 - 2¹⁹ = 78345389 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78869657) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39434838 + 39434839.

It is an arithmetic number, because the mean of its divisors is an integer number (39434839).

Almost surely, 2^78869677 is an apocalyptic number.

It is an amenable number.

78869677 is a deficient number, since it is larger than the sum of its proper divisors (1).

78869677 is an equidigital number, since it uses as much as digits as its factorization.

78869677 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7112448, while the sum is 58.

The square root of 78869677 is about 8880.8601497828. The cubic root of 78869677 is about 428.8479654989.

The spelling of 78869677 in words is "seventy-eight million, eight hundred sixty-nine thousand, six hundred seventy-seven".