8421857280 has 384 divisors, whose sum is σ = 30380313600. Its totient is φ = 2212724736.

The previous prime is 8421857263. The next prime is 8421857303. The reversal of 8421857280 is 827581248.

It is a happy number.

8421857280 is a `hidden beast` number, since 8 + 421 + 85 + 72 + 80 = 666.

It is a tau number, because it is divible by the number of its divisors (384).

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 22947657 + ... + 22948023.

It is an arithmetic number, because the mean of its divisors is an integer number (79115400).

Almost surely, 2^8421857280 is an apocalyptic number.

8421857280 is a gapful number since it is divisible by the number (80) 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 8421857280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (15190156800).

8421857280 is an abundant number, since it is smaller than the sum of its proper divisors (21958456320).

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

8421857280 is a wasteful number, since it uses less digits than its factorization.

8421857280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 486 (or 460 counting only the distinct ones).

The product of its (nonzero) digits is 286720, while the sum is 45.

The square root of 8421857280 is about 91770.6776699399. The cubic root of 8421857280 is about 2034.5543341665.

The spelling of 8421857280 in words is "eight billion, four hundred twenty-one million, eight hundred fifty-seven thousand, two hundred eighty".