2805801856 has 256 divisors, whose sum is σ = 7106641920. Its totient is φ = 1083801600.

The previous prime is 2805801827. The next prime is 2805801857. The reversal of 2805801856 is 6581085082.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2805801857) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 22092865 + ... + 22092991.

It is an arithmetic number, because the mean of its divisors is an integer number (27760320).

Almost surely, 2^2805801856 is an apocalyptic number.

2805801856 is a gapful number since it is divisible by the number (26) 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 2805801856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3553320960).

2805801856 is an abundant number, since it is smaller than the sum of its proper divisors (4300840064).

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

2805801856 is a wasteful number, since it uses less digits than its factorization.

2805801856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 253 (or 241 counting only the distinct ones).

The product of its (nonzero) digits is 153600, while the sum is 43.

The square root of 2805801856 is about 52969.8202375655. The cubic root of 2805801856 is about 1410.4325846053.

The spelling of 2805801856 in words is "two billion, eight hundred five million, eight hundred one thousand, eight hundred fifty-six".