2821259805 has 96 divisors (see below), whose sum is σ = 5738552064. Its totient is φ = 1158064128.

The previous prime is 2821259773. The next prime is 2821259827. The reversal of 2821259805 is 5089521282.

It is not a de Polignac number, because 2821259805 - 2⁵ = 2821259773 is a prime.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 654417 + ... + 658713.

It is an arithmetic number, because the mean of its divisors is an integer number (59776584).

Almost surely, 2^2821259805 is an apocalyptic number.

It is an amenable number.

2821259805 is an abundant number, since it is smaller than the sum of its proper divisors (2917292259).

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

2821259805 is a wasteful number, since it uses less digits than its factorization.

2821259805 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4375 (or 4362 counting only the distinct ones).

The product of its (nonzero) digits is 115200, while the sum is 42.

The square root of 2821259805 is about 53115.5326152341. The cubic root of 2821259805 is about 1413.0179986478.

The spelling of 2821259805 in words is "two billion, eight hundred twenty-one million, two hundred fifty-nine thousand, eight hundred five".