2851261587820 has 48 divisors (see below), whose sum is σ = 5996441249568. Its totient is φ = 1138830658560.

The previous prime is 2851261587793. The next prime is 2851261587893. The reversal of 2851261587820 is 287851621582.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 78113494 + ... + 78149986.

It is an arithmetic number, because the mean of its divisors is an integer number (124925859366).

Almost surely, 2^{2851261587820} is an apocalyptic number.

2851261587820 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2851261587820 is an abundant number, since it is smaller than the sum of its proper divisors (3145179661748).

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

2851261587820 is a wasteful number, since it uses less digits than its factorization.

2851261587820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42130 (or 42128 counting only the distinct ones).

The product of its (nonzero) digits is 4300800, while the sum is 55.

The spelling of 2851261587820 in words is "two trillion, eight hundred fifty-one billion, two hundred sixty-one million, five hundred eighty-seven thousand, eight hundred twenty".