79221818240 has 64 divisors (see below), whose sum is σ = 197624028960. Its totient is φ = 30310950912.

The previous prime is 79221818233. The next prime is 79221818243. The reversal of 79221818240 is 4281812297.

It is a tau number, because it is divible by the number of its divisors (64).

It is a junction number, because it is equal to n+sod(n) for n = 79221818191 and 79221818200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (79221818243) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2676239 + ... + 2705678.

Almost surely, 2^79221818240 is an apocalyptic number.

It is an amenable number.

79221818240 is an abundant number, since it is smaller than the sum of its proper divisors (118402210720).

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

79221818240 is a wasteful number, since it uses less digits than its factorization.

79221818240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5381959 (or 5381947 counting only the distinct ones).

The product of its (nonzero) digits is 129024, while the sum is 44.

The spelling of 79221818240 in words is "seventy-nine billion, two hundred twenty-one million, eight hundred eighteen thousand, two hundred forty".