2781663996 has 36 divisors (see below), whose sum is σ = 6668633832. Its totient is φ = 901800864.

The previous prime is 2781663967. The next prime is 2781664009. The reversal of 2781663996 is 6993661872.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1110081 + ... + 1112583.

Almost surely, 2^2781663996 is an apocalyptic number.

It is an amenable number.

2781663996 is an abundant number, since it is smaller than the sum of its proper divisors (3886969836).

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

2781663996 is an equidigital number, since it uses as much as digits as its factorization.

2781663996 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5050 (or 2545 counting only the distinct ones).

The product of its digits is 5878656, while the sum is 57.

The square root of 2781663996 is about 52741.4826867808. The cubic root of 2781663996 is about 1406.3763560378.

The spelling of 2781663996 in words is "two billion, seven hundred eighty-one million, six hundred sixty-three thousand, nine hundred ninety-six".