79745840 has 80 divisors (see below), whose sum is σ = 191987712. Its totient is φ = 30788352.

The previous prime is 79745837. The next prime is 79745873. The reversal of 79745840 is 4854797.

It is a tau number, because it is divible by the number of its divisors (80).

It is a junction number, because it is equal to n+sod(n) for n = 79745791 and 79745800.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 477437 + ... + 477603.

Almost surely, 2^79745840 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 79745840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (95993856).

79745840 is an abundant number, since it is smaller than the sum of its proper divisors (112241872).

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

79745840 is a wasteful number, since it uses less digits than its factorization.

79745840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 354 (or 348 counting only the distinct ones).

The product of its (nonzero) digits is 282240, while the sum is 44.

The square root of 79745840 is about 8930.0526314238. The cubic root of 79745840 is about 430.4301446528.

The spelling of 79745840 in words is "seventy-nine million, seven hundred forty-five thousand, eight hundred forty".