7778066 has 16 divisors (see below), whose sum is σ = 12127320. Its totient is φ = 3738240.

The previous prime is 7778063. The next prime is 7778081. The reversal of 7778066 is 6608777.

It can be written as a sum of positive squares in 4 ways, for example, as 7722841 + 55225 = 2779^2 + 235^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7778063) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5996 + ... + 7176.

Almost surely, 2^7778066 is an apocalyptic number.

7778066 is a deficient number, since it is larger than the sum of its proper divisors (4349254).

7778066 is a wasteful number, since it uses less digits than its factorization.

7778066 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1309.

The product of its (nonzero) digits is 98784, while the sum is 41.

The square root of 7778066 is about 2788.9184283518. The cubic root of 7778066 is about 198.1331791148.

The spelling of 7778066 in words is "seven million, seven hundred seventy-eight thousand, sixty-six".