78820863 has 16 divisors (see below), whose sum is σ = 116266752. Its totient is φ = 47096000.

The previous prime is 78820831. The next prime is 78820897. The reversal of 78820863 is 36802887.

It is a cyclic number.

It is not a de Polignac number, because 78820863 - 2⁵ = 78820831 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78820813) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14478 + ... + 19163.

It is an arithmetic number, because the mean of its divisors is an integer number (7266672).

Almost surely, 2^78820863 is an apocalyptic number.

78820863 is a deficient number, since it is larger than the sum of its proper divisors (37445889).

78820863 is a wasteful number, since it uses less digits than its factorization.

78820863 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33726.

The product of its (nonzero) digits is 129024, while the sum is 42.

The square root of 78820863 is about 8878.1114545831. Note that the first 3 decimals coincide. The cubic root of 78820863 is about 428.7594730827.

The spelling of 78820863 in words is "seventy-eight million, eight hundred twenty thousand, eight hundred sixty-three".