77863393 has 2 divisors, whose sum is σ = 77863394. Its totient is φ = 77863392.

The previous prime is 77863381. The next prime is 77863397. The reversal of 77863393 is 39336877.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 77739489 + 123904 = 8817^2 + 352^2 .

It is a cyclic number.

It is not a de Polignac number, because 77863393 - 2²⁵ = 44308961 is a prime.

It is not a weakly prime, because it can be changed into another prime (77863397) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38931696 + 38931697.

It is an arithmetic number, because the mean of its divisors is an integer number (38931697).

Almost surely, 2^77863393 is an apocalyptic number.

It is an amenable number.

77863393 is a deficient number, since it is larger than the sum of its proper divisors (1).

77863393 is an equidigital number, since it uses as much as digits as its factorization.

77863393 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 571536, while the sum is 46.

The square root of 77863393 is about 8824.0236287082. The cubic root of 77863393 is about 427.0162886140.

The spelling of 77863393 in words is "seventy-seven million, eight hundred sixty-three thousand, three hundred ninety-three".