2279806781 has 16 divisors (see below), whose sum is σ = 2664278400. Its totient is φ = 1949996160.

The previous prime is 2279806721. The next prime is 2279806801. The reversal of 2279806781 is 1876089722.

It is a de Polignac number, because none of the positive numbers 2^k-2279806781 is a prime.

It is a super-2 number, since 2×2279806781² = 10395037917387163922, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2279806721) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 161645 + ... + 175181.

It is an arithmetic number, because the mean of its divisors is an integer number (166517400).

Almost surely, 2^2279806781 is an apocalyptic number.

It is an amenable number.

2279806781 is a deficient number, since it is larger than the sum of its proper divisors (384471619).

2279806781 is an equidigital number, since it uses as much as digits as its factorization.

2279806781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14049 (or 14035 counting only the distinct ones).

The product of its (nonzero) digits is 677376, while the sum is 50.

The square root of 2279806781 is about 47747.3222390534. The cubic root of 2279806781 is about 1316.1316923439.

The spelling of 2279806781 in words is "two billion, two hundred seventy-nine million, eight hundred six thousand, seven hundred eighty-one".