806091778 has 4 divisors (see below), whose sum is σ = 1209137670. Its totient is φ = 403045888.

The previous prime is 806091763. The next prime is 806091821. The reversal of 806091778 is 877190608.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 745672249 + 60419529 = 27307^2 + 7773^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 201522943 + ... + 201522946.

Almost surely, 2^806091778 is an apocalyptic number.

806091778 is a deficient number, since it is larger than the sum of its proper divisors (403045892).

806091778 is a wasteful number, since it uses less digits than its factorization.

806091778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 403045891.

The product of its (nonzero) digits is 169344, while the sum is 46.

The square root of 806091778 is about 28391.7554582312. The cubic root of 806091778 is about 930.6681051162.

The spelling of 806091778 in words is "eight hundred six million, ninety-one thousand, seven hundred seventy-eight".