78917863 has 8 divisors (see below), whose sum is σ = 79477632. Its totient is φ = 78360696.

The previous prime is 78917851. The next prime is 78917873. The reversal of 78917863 is 36871987.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 78917863 - 2⁵ = 78917831 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78917803) 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 in 7 ways as a sum of consecutive naturals, for example, 161806 + ... + 162292.

It is an arithmetic number, because the mean of its divisors is an integer number (9934704).

Almost surely, 2^78917863 is an apocalyptic number.

78917863 is a deficient number, since it is larger than the sum of its proper divisors (559769).

78917863 is a wasteful number, since it uses less digits than its factorization.

78917863 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1301.

The product of its digits is 508032, while the sum is 49.

The square root of 78917863 is about 8883.5726484337. The cubic root of 78917863 is about 428.9352836416.

The spelling of 78917863 in words is "seventy-eight million, nine hundred seventeen thousand, eight hundred sixty-three".