79900 has 36 divisors (see below), whose sum is σ = 187488. Its totient is φ = 29440.

The previous prime is 79889. The next prime is 79901. The reversal of 79900 is 997.

79900 is nontrivially palindromic in base 13.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (79901) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1677 + ... + 1723.

It is an arithmetic number, because the mean of its divisors is an integer number (5208).

2⁷⁹⁹⁰⁰ is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 79900, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (93744).

79900 is an abundant number, since it is smaller than the sum of its proper divisors (107588).

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

79900 is a wasteful number, since it uses less digits than its factorization.

79900 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78 (or 71 counting only the distinct ones).

The product of its (nonzero) digits is 567, while the sum is 25.

The square root of 79900 is about 282.6658805021. The cubic root of 79900 is about 43.0707326923.

It can be divided in two parts, 79 and 900, that added together give a palindrome (979).

The spelling of 79900 in words is "seventy-nine thousand, nine hundred".