2781631680 has 56 divisors (see below), whose sum is σ = 8831683632. Its totient is φ = 741768192.

The previous prime is 2781631669. The next prime is 2781631693. The reversal of 2781631680 is 861361872.

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 7 ways as a sum of consecutive naturals, for example, 1447807 + ... + 1449726.

Almost surely, 2^2781631680 is an apocalyptic number.

2781631680 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2781631680 is an abundant number, since it is smaller than the sum of its proper divisors (6050051952).

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

2781631680 is a wasteful number, since it uses less digits than its factorization.

2781631680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2897553 (or 2897543 counting only the distinct ones).

The product of its (nonzero) digits is 96768, while the sum is 42.

The square root of 2781631680 is about 52741.1763236278. The cubic root of 2781631680 is about 1406.3709098211.

The spelling of 2781631680 in words is "two billion, seven hundred eighty-one million, six hundred thirty-one thousand, six hundred eighty".