2781329864 has 16 divisors (see below), whose sum is σ = 5215605120. Its totient is φ = 1390501840.

The previous prime is 2781329861. The next prime is 2781329867. The reversal of 2781329864 is 4689231872.

It is an interprime number because it is at equal distance from previous prime (2781329861) and next prime (2781329867).

It is not an unprimeable number, because it can be changed into a prime (2781329861) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 82829 + ... + 111459.

It is an arithmetic number, because the mean of its divisors is an integer number (325975320).

Almost surely, 2^2781329864 is an apocalyptic number.

It is an amenable number.

2781329864 is a deficient number, since it is larger than the sum of its proper divisors (2434275256).

2781329864 is a wasteful number, since it uses less digits than its factorization.

2781329864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40780 (or 40776 counting only the distinct ones).

The product of its digits is 1161216, while the sum is 50.

The square root of 2781329864 is about 52738.3149522243. The cubic root of 2781329864 is about 1406.3200427229.

The spelling of 2781329864 in words is "two billion, seven hundred eighty-one million, three hundred twenty-nine thousand, eight hundred sixty-four".