77848861 has 2 divisors, whose sum is σ = 77848862. Its totient is φ = 77848860.

The previous prime is 77848853. The next prime is 77848889. The reversal of 77848861 is 16884877.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 42968025 + 34880836 = 6555^2 + 5906^2 .

It is a cyclic number.

It is not a de Polignac number, because 77848861 - 2³ = 77848853 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (77848811) 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, 38924430 + 38924431.

It is an arithmetic number, because the mean of its divisors is an integer number (38924431).

Almost surely, 2^77848861 is an apocalyptic number.

It is an amenable number.

77848861 is a deficient number, since it is larger than the sum of its proper divisors (1).

77848861 is an equidigital number, since it uses as much as digits as its factorization.

77848861 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 602112, while the sum is 49.

The square root of 77848861 is about 8823.2001564058. The cubic root of 77848861 is about 426.9897216290.

The spelling of 77848861 in words is "seventy-seven million, eight hundred forty-eight thousand, eight hundred sixty-one".