79640 has 32 divisors (see below), whose sum is σ = 196560. Its totient is φ = 28800.

The previous prime is 79633. The next prime is 79657. The reversal of 79640 is 4697.

It is a congruent number.

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, 350 + ... + 530.

2⁷⁹⁶⁴⁰ 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 79640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (98280).

79640 is an abundant number, since it is smaller than the sum of its proper divisors (116920).

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

79640 is a wasteful number, since it uses less digits than its factorization.

79640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 203 (or 199 counting only the distinct ones).

The product of its (nonzero) digits is 1512, while the sum is 26.

The square root of 79640 is about 282.2055988105. The cubic root of 79640 is about 43.0239635673.

The spelling of 79640 in words is "seventy-nine thousand, six hundred forty".