78116777 has 2 divisors, whose sum is σ = 78116778. Its totient is φ = 78116776.

The previous prime is 78116761. The next prime is 78116803. The reversal of 78116777 is 77761187.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 54922921 + 23193856 = 7411^2 + 4816^2 .

It is a cyclic number.

It is not a de Polignac number, because 78116777 - 2⁴ = 78116761 is a prime.

It is a super-2 number, since 2×78116777² = 12204461697735458, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (78116477) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39058388 + 39058389.

It is an arithmetic number, because the mean of its divisors is an integer number (39058389).

Almost surely, 2^78116777 is an apocalyptic number.

It is an amenable number.

78116777 is a deficient number, since it is larger than the sum of its proper divisors (1).

78116777 is an equidigital number, since it uses as much as digits as its factorization.

78116777 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 115248, while the sum is 44.

The square root of 78116777 is about 8838.3695894661. The cubic root of 78116777 is about 427.4789876019.

The spelling of 78116777 in words is "seventy-eight million, one hundred sixteen thousand, seven hundred seventy-seven".