2851681236 has 24 divisors (see below), whose sum is σ = 6655104960. Its totient is φ = 950391552.

The previous prime is 2851681219. The next prime is 2851681237. The reversal of 2851681236 is 6321861582.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2851681237) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 62505 + ... + 98031.

It is an arithmetic number, because the mean of its divisors is an integer number (277296040).

Almost surely, 2^2851681236 is an apocalyptic number.

It is an amenable number.

2851681236 is an abundant number, since it is smaller than the sum of its proper divisors (3803423724).

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

2851681236 is a wasteful number, since it uses less digits than its factorization.

2851681236 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42223 (or 42221 counting only the distinct ones).

The product of its digits is 138240, while the sum is 42.

The square root of 2851681236 is about 53401.1351564740. The cubic root of 2851681236 is about 1418.0786744258.

The spelling of 2851681236 in words is "two billion, eight hundred fifty-one million, six hundred eighty-one thousand, two hundred thirty-six".