2800121856 has 288 divisors, whose sum is σ = 8873504640. Its totient is φ = 782745600.

The previous prime is 2800121843. The next prime is 2800121861. The reversal of 2800121856 is 6581210082.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 21374911 + ... + 21375041.

It is an arithmetic number, because the mean of its divisors is an integer number (30810780).

Almost surely, 2^2800121856 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 2800121856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4436752320).

2800121856 is an abundant number, since it is smaller than the sum of its proper divisors (6073382784).

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

2800121856 is a wasteful number, since it uses less digits than its factorization.

2800121856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 241 (or 214 counting only the distinct ones).

The product of its (nonzero) digits is 7680, while the sum is 33.

The square root of 2800121856 is about 52916.1776397351. The cubic root of 2800121856 is about 1409.4801926791.

The spelling of 2800121856 in words is "two billion, eight hundred million, one hundred twenty-one thousand, eight hundred fifty-six".