78819 has 16 divisors (see below), whose sum is σ = 118272. Its totient is φ = 46368.

The previous prime is 78809. The next prime is 78823. The reversal of 78819 is 91887.

It is not a de Polignac number, because 78819 - 2⁴ = 78803 is a prime.

It is a super-2 number, since 2×78819² = 12424869522, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 78819.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78809) 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, 1654 + ... + 1700.

It is an arithmetic number, because the mean of its divisors is an integer number (7392).

2⁷⁸⁸¹⁹ is an apocalyptic number.

78819 is a deficient number, since it is larger than the sum of its proper divisors (39453).

78819 is a wasteful number, since it uses less digits than its factorization.

78819 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 106.

The product of its digits is 4032, while the sum is 33.

The square root of 78819 is about 280.7472172614. The cubic root of 78819 is about 42.8756095021.

The spelling of 78819 in words is "seventy-eight thousand, eight hundred nineteen".