2787290781 has 24 divisors (see below), whose sum is σ = 4087930560. Its totient is φ = 1688037120.

The previous prime is 2787290749. The next prime is 2787290791. The reversal of 2787290781 is 1870927872.

It is a happy number.

2787290781 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 2787290781 - 2⁵ = 2787290749 is a prime.

It is a super-2 number, since 2×2787290781² = 15537979795695179922, which contains 22 as substring.

It is an alternating number because its digits alternate between even and odd.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2787290731) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 877965 + ... + 881133.

It is an arithmetic number, because the mean of its divisors is an integer number (170330440).

Almost surely, 2^2787290781 is an apocalyptic number.

It is an amenable number.

2787290781 is a deficient number, since it is larger than the sum of its proper divisors (1300639779).

2787290781 is a wasteful number, since it uses less digits than its factorization.

2787290781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5617 (or 5606 counting only the distinct ones).

The product of its (nonzero) digits is 790272, while the sum is 51.

The square root of 2787290781 is about 52794.7988063218. The cubic root of 2787290781 is about 1407.3239959665.

The spelling of 2787290781 in words is "two billion, seven hundred eighty-seven million, two hundred ninety thousand, seven hundred eighty-one".