79321840 has 60 divisors (see below), whose sum is σ = 199734984. Its totient is φ = 29283072.

The previous prime is 79321829. The next prime is 79321843. The reversal of 79321840 is 4812397.

It is a junction number, because it is equal to n+sod(n) for n = 79321796 and 79321805.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (79321843) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 10587 + ... + 16453.

Almost surely, 2^79321840 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 79321840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (99867492).

79321840 is an abundant number, since it is smaller than the sum of its proper divisors (120413144).

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

79321840 is a wasteful number, since it uses less digits than its factorization.

79321840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5906 (or 5887 counting only the distinct ones).

The product of its (nonzero) digits is 12096, while the sum is 34.

The square root of 79321840 is about 8906.2809297709. The cubic root of 79321840 is about 429.6659384839.

The spelling of 79321840 in words is "seventy-nine million, three hundred twenty-one thousand, eight hundred forty".