78787663 has 2 divisors, whose sum is σ = 78787664. Its totient is φ = 78787662.

The previous prime is 78787649. The next prime is 78787669. The reversal of 78787663 is 36678787.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 78787663 - 2²⁵ = 45233231 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 78787663.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78787669) 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, 39393831 + 39393832.

It is an arithmetic number, because the mean of its divisors is an integer number (39393832).

Almost surely, 2^78787663 is an apocalyptic number.

78787663 is a deficient number, since it is larger than the sum of its proper divisors (1).

78787663 is an equidigital number, since it uses as much as digits as its factorization.

78787663 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2370816, while the sum is 52.

The square root of 78787663 is about 8876.2414906310. The cubic root of 78787663 is about 428.6992656155.

The spelling of 78787663 in words is "seventy-eight million, seven hundred eighty-seven thousand, six hundred sixty-three".