78079777 has 2 divisors, whose sum is σ = 78079778. Its totient is φ = 78079776.

The previous prime is 78079769. The next prime is 78079783. The reversal of 78079777 is 77797087.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 47210641 + 30869136 = 6871^2 + 5556^2 .

It is a cyclic number.

It is not a de Polignac number, because 78079777 - 2³ = 78079769 is a prime.

It is not a weakly prime, because it can be changed into another prime (78079747) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39039888 + 39039889.

It is an arithmetic number, because the mean of its divisors is an integer number (39039889).

Almost surely, 2^78079777 is an apocalyptic number.

It is an amenable number.

78079777 is a deficient number, since it is larger than the sum of its proper divisors (1).

78079777 is an equidigital number, since it uses as much as digits as its factorization.

78079777 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1210104, while the sum is 52.

The square root of 78079777 is about 8836.2761953212. The cubic root of 78079777 is about 427.4114851566.

The spelling of 78079777 in words is "seventy-eight million, seventy-nine thousand, seven hundred seventy-seven".