5251978820 has 96 divisors (see below), whose sum is σ = 12345177600. Its totient is φ = 1860584960.

The previous prime is 5251978819. The next prime is 5251978877. The reversal of 5251978820 is 288791525.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1735829 + ... + 1738851.

It is an arithmetic number, because the mean of its divisors is an integer number (128595600).

Almost surely, 2^5251978820 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 5251978820, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (6172588800).

5251978820 is an abundant number, since it is smaller than the sum of its proper divisors (7093198780).

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

5251978820 is a wasteful number, since it uses less digits than its factorization.

5251978820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3245 (or 3243 counting only the distinct ones).

The product of its (nonzero) digits is 403200, while the sum is 47.

The square root of 5251978820 is about 72470.5375997722. The cubic root of 5251978820 is about 1738.2316579043.

The spelling of 5251978820 in words is "five billion, two hundred fifty-one million, nine hundred seventy-eight thousand, eight hundred twenty".