77748977 has 2 divisors, whose sum is σ = 77748978. Its totient is φ = 77748976.

The previous prime is 77748967. The next prime is 77749027. The reversal of 77748977 is 77984777.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 59737441 + 18011536 = 7729^2 + 4244^2 .

It is a cyclic number.

It is not a de Polignac number, because 77748977 - 2²⁰ = 76700401 is a prime.

It is not a weakly prime, because it can be changed into another prime (77748907) 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, 38874488 + 38874489.

It is an arithmetic number, because the mean of its divisors is an integer number (38874489).

Almost surely, 2^77748977 is an apocalyptic number.

It is an amenable number.

77748977 is a deficient number, since it is larger than the sum of its proper divisors (1).

77748977 is an equidigital number, since it uses as much as digits as its factorization.

77748977 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4840416, while the sum is 56.

The square root of 77748977 is about 8817.5380350753. The cubic root of 77748977 is about 426.8070270493.

The spelling of 77748977 in words is "seventy-seven million, seven hundred forty-eight thousand, nine hundred seventy-seven".