79217487640 has 16 divisors (see below), whose sum is σ = 178239347280. Its totient is φ = 31686995040.

The previous prime is 79217487619. The next prime is 79217487647. The reversal of 79217487640 is 4678471297.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (79217487647) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 990218556 + ... + 990218635.

It is an arithmetic number, because the mean of its divisors is an integer number (11139959205).

Almost surely, 2^79217487640 is an apocalyptic number.

It is an amenable number.

79217487640 is an abundant number, since it is smaller than the sum of its proper divisors (99021859640).

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

79217487640 is a wasteful number, since it uses less digits than its factorization.

79217487640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1980437202 (or 1980437198 counting only the distinct ones).

The product of its (nonzero) digits is 4741632, while the sum is 55.

The spelling of 79217487640 in words is "seventy-nine billion, two hundred seventeen million, four hundred eighty-seven thousand, six hundred forty".