8520837444 has 240 divisors, whose sum is σ = 27828218880. Its totient is φ = 2217093120.

The previous prime is 8520837421. The next prime is 8520837463. The reversal of 8520837444 is 4447380258.

It is a happy number.

8520837444 is a `hidden beast` number, since 8 + 520 + 83 + 7 + 4 + 44 = 666.

It is a self number, because there is not a number n which added to its sum of digits gives 8520837444.

It is an unprimeable number.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 1191672 + ... + 1198800.

It is an arithmetic number, because the mean of its divisors is an integer number (115950912).

Almost surely, 2^8520837444 is an apocalyptic number.

8520837444 is a gapful number since it is divisible by the number (84) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 8520837444, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (13914109440).

8520837444 is an abundant number, since it is smaller than the sum of its proper divisors (19307381436).

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

8520837444 is a wasteful number, since it uses less digits than its factorization.

8520837444 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7200 (or 7189 counting only the distinct ones).

The product of its (nonzero) digits is 860160, while the sum is 45.

The square root of 8520837444 is about 92308.3823062673. The cubic root of 8520837444 is about 2042.4938618230.

The spelling of 8520837444 in words is "eight billion, five hundred twenty million, eight hundred thirty-seven thousand, four hundred forty-four".