78057977 has 2 divisors, whose sum is σ = 78057978. Its totient is φ = 78057976.

The previous prime is 78057919. The next prime is 78057989. The reversal of 78057977 is 77975087.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 43612816 + 34445161 = 6604^2 + 5869^2 .

It is a cyclic number.

It is not a de Polignac number, because 78057977 - 2⁶ = 78057913 is a prime.

It is not a weakly prime, because it can be changed into another prime (78057877) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39028988 + 39028989.

It is an arithmetic number, because the mean of its divisors is an integer number (39028989).

Almost surely, 2^78057977 is an apocalyptic number.

It is an amenable number.

78057977 is a deficient number, since it is larger than the sum of its proper divisors (1).

78057977 is an equidigital number, since it uses as much as digits as its factorization.

78057977 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 864360, while the sum is 50.

The square root of 78057977 is about 8835.0425579054. The cubic root of 78057977 is about 427.3717034614.

The spelling of 78057977 in words is "seventy-eight million, fifty-seven thousand, nine hundred seventy-seven".