78105863 has 6 divisors (see below), whose sum is σ = 85852032. Its totient is φ = 71005220.

The previous prime is 78105857. The next prime is 78105899. The reversal of 78105863 is 36850187.

It is not a de Polignac number, because 78105863 - 2⁸ = 78105607 is a prime.

It is a super-2 number, since 2×78105863² = 12201051669949538, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78105163) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 322631 + ... + 322872.

It is an arithmetic number, because the mean of its divisors is an integer number (14308672).

Almost surely, 2^78105863 is an apocalyptic number.

78105863 is a deficient number, since it is larger than the sum of its proper divisors (7746169).

78105863 is a wasteful number, since it uses less digits than its factorization.

78105863 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 645525 (or 645514 counting only the distinct ones).

The product of its (nonzero) digits is 40320, while the sum is 38.

The square root of 78105863 is about 8837.7521463322. The cubic root of 78105863 is about 427.4590784217.

The spelling of 78105863 in words is "seventy-eight million, one hundred five thousand, eight hundred sixty-three".