7879856436 has 18 divisors (see below), whose sum is σ = 19918526082. Its totient is φ = 2626618800.

The previous prime is 7879856389. The next prime is 7879856437. The reversal of 7879856436 is 6346589787.

It can be written as a sum of positive squares in only one way, i.e., 6595064100 + 1284792336 = 81210^2 + 35844^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7879856437) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 109442415 + ... + 109442486.

Almost surely, 2^7879856436 is an apocalyptic number.

It is an amenable number.

7879856436 is an abundant number, since it is smaller than the sum of its proper divisors (12038669646).

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

7879856436 is a wasteful number, since it uses less digits than its factorization.

7879856436 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 218884911 (or 218884906 counting only the distinct ones).

The product of its digits is 60963840, while the sum is 63.

The square root of 7879856436 is about 88768.5554461714. Note that the first 3 decimals coincide. The cubic root of 7879856436 is about 1989.9374942279.

The spelling of 7879856436 in words is "seven billion, eight hundred seventy-nine million, eight hundred fifty-six thousand, four hundred thirty-six".