78816877 has 2 divisors, whose sum is σ = 78816878. Its totient is φ = 78816876.

The previous prime is 78816863. The next prime is 78816889. The reversal of 78816877 is 77861887.

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., 65755881 + 13060996 = 8109^2 + 3614^2 .

It is a cyclic number.

It is not a de Polignac number, because 78816877 - 2¹⁹ = 78292589 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78816817) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39408438 + 39408439.

It is an arithmetic number, because the mean of its divisors is an integer number (39408439).

Almost surely, 2^78816877 is an apocalyptic number.

It is an amenable number.

78816877 is a deficient number, since it is larger than the sum of its proper divisors (1).

78816877 is an equidigital number, since it uses as much as digits as its factorization.

78816877 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1053696, while the sum is 52.

The square root of 78816877 is about 8877.8869670660. The cubic root of 78816877 is about 428.7522454529.

The spelling of 78816877 in words is "seventy-eight million, eight hundred sixteen thousand, eight hundred seventy-seven".