79783487644 has 48 divisors (see below), whose sum is σ = 169227721152. Its totient is φ = 32129298432.

The previous prime is 79783487639. The next prime is 79783487659. The reversal of 79783487644 is 44678438797.

It is a self number, because there is not a number n which added to its sum of digits gives 79783487644.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 157864 + ... + 429520.

It is an arithmetic number, because the mean of its divisors is an integer number (3525577524).

Almost surely, 2^79783487644 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 79783487644, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (84613860576).

79783487644 is an abundant number, since it is smaller than the sum of its proper divisors (89444233508).

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

79783487644 is a wasteful number, since it uses less digits than its factorization.

79783487644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 272302 (or 272300 counting only the distinct ones).

The product of its digits is 227598336, while the sum is 67.

The spelling of 79783487644 in words is "seventy-nine billion, seven hundred eighty-three million, four hundred eighty-seven thousand, six hundred forty-four".