78020 has 24 divisors (see below), whose sum is σ = 169344. Its totient is φ = 30176.

The previous prime is 78017. The next prime is 78031. The reversal of 78020 is 2087.

It is a self number, because there is not a number n which added to its sum of digits gives 78020.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 899 + ... + 981.

It is an arithmetic number, because the mean of its divisors is an integer number (7056).

2⁷⁸⁰²⁰ is an apocalyptic number.

It is an amenable number.

78020 is an abundant number, since it is smaller than the sum of its proper divisors (91324).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

It is a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (84672).

78020 is a wasteful number, since it uses less digits than its factorization.

78020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 139 (or 137 counting only the distinct ones).

The product of its (nonzero) digits is 112, while the sum is 17.

The square root of 78020 is about 279.3206043241. The cubic root of 78020 is about 42.7302383499.

The spelling of 78020 in words is "seventy-eight thousand, twenty".