78576779 has 2 divisors, whose sum is σ = 78576780. Its totient is φ = 78576778.

The previous prime is 78576767. The next prime is 78576791. The reversal of 78576779 is 97767587.

It is a balanced prime because it is at equal distance from previous prime (78576767) and next prime (78576791).

It is an emirp because it is prime and its reverse (97767587) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-78576779 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (78576709) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39288389 + 39288390.

It is an arithmetic number, because the mean of its divisors is an integer number (39288390).

Almost surely, 2^78576779 is an apocalyptic number.

78576779 is a deficient number, since it is larger than the sum of its proper divisors (1).

78576779 is an equidigital number, since it uses as much as digits as its factorization.

78576779 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5186160, while the sum is 56.

The square root of 78576779 is about 8864.3544040161. The cubic root of 78576779 is about 428.3164366586.

The spelling of 78576779 in words is "seventy-eight million, five hundred seventy-six thousand, seven hundred seventy-nine".