79780 has 12 divisors (see below), whose sum is σ = 167580. Its totient is φ = 31904.

The previous prime is 79777. The next prime is 79801. The reversal of 79780 is 8797.

It can be written as a sum of positive squares in 2 ways, for example, as 33124 + 46656 = 182^2 + 216^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1975 + ... + 2014.

It is an arithmetic number, because the mean of its divisors is an integer number (13965).

2⁷⁹⁷⁸⁰ is an apocalyptic number.

It is an amenable number.

79780 is an abundant number, since it is smaller than the sum of its proper divisors (87800).

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 (83790).

79780 is a wasteful number, since it uses less digits than its factorization.

79780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3998 (or 3996 counting only the distinct ones).

The product of its (nonzero) digits is 3528, while the sum is 31.

The square root of 79780 is about 282.4535360019. The cubic root of 79780 is about 43.0491595694.

The spelling of 79780 in words is "seventy-nine thousand, seven hundred eighty".