2806681778 has 8 divisors (see below), whose sum is σ = 4236838572. Its totient is φ = 1394402256.

The previous prime is 2806681777. The next prime is 2806681783. The reversal of 2806681778 is 8771866082.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 2615606449 + 191075329 = 51143^2 + 13823^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (2806681777) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4468925 + ... + 4469552.

Almost surely, 2^2806681778 is an apocalyptic number.

2806681778 is a deficient number, since it is larger than the sum of its proper divisors (1430156794).

2806681778 is a wasteful number, since it uses less digits than its factorization.

2806681778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8938636.

The product of its (nonzero) digits is 1806336, while the sum is 53.

The square root of 2806681778 is about 52978.1254670265. The cubic root of 2806681778 is about 1410.5800101911.

The spelling of 2806681778 in words is "two billion, eight hundred six million, six hundred eighty-one thousand, seven hundred seventy-eight".