879783387978 has 128 divisors (see below), whose sum is σ = 1969420677120. Its totient is φ = 259779237120.

The previous prime is 879783387971. The next prime is 879783388027.

It is a happy number.

879783387978 is nontrivially palindromic in base 10.

879783387978 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 879783387978.

It is not an unprimeable number, because it can be changed into a prime (879783387971) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 154534900 + ... + 154540592.

It is an arithmetic number, because the mean of its divisors is an integer number (15386099040).

Almost surely, 2^879783387978 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 879783387978, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (984710338560).

879783387978 is an abundant number, since it is smaller than the sum of its proper divisors (1089637289142).

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

879783387978 is a wasteful number, since it uses less digits than its factorization.

879783387978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6172.

The product of its digits is 7169347584, while the sum is 84.

The spelling of 879783387978 in words is "eight hundred seventy-nine billion, seven hundred eighty-three million, three hundred eighty-seven thousand, nine hundred seventy-eight".