2787216642 has 80 divisors (see below), whose sum is σ = 7201130112. Its totient is φ = 789264000.

The previous prime is 2787216559. The next prime is 2787216671. The reversal of 2787216642 is 2466127872.

It is a happy 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 39 ways as a sum of consecutive naturals, for example, 117267 + ... + 139017.

Almost surely, 2^2787216642 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2787216642, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3600565056).

2787216642 is an abundant number, since it is smaller than the sum of its proper divisors (4413913470).

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

2787216642 is a wasteful number, since it uses less digits than its factorization.

2787216642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21885 (or 21876 counting only the distinct ones).

The product of its digits is 451584, while the sum is 45.

The square root of 2787216642 is about 52794.0966586227. The cubic root of 2787216642 is about 1407.3115180770.

The spelling of 2787216642 in words is "two billion, seven hundred eighty-seven million, two hundred sixteen thousand, six hundred forty-two".