3666778 has 4 divisors (see below), whose sum is σ = 5500170. Its totient is φ = 1833388.

The previous prime is 3666757. The next prime is 3666787. The reversal of 3666778 is 8776663.

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., 3621409 + 45369 = 1903^2 + 213^2 .

It is an Ulam number.

It is a plaindrome in base 10.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 916693 + ... + 916696.

Almost surely, 2^3666778 is an apocalyptic number.

3666778 is a deficient number, since it is larger than the sum of its proper divisors (1833392).

3666778 is a wasteful number, since it uses less digits than its factorization.

3666778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1833391.

The product of its digits is 254016, while the sum is 43.

The square root of 3666778 is about 1914.8832862605. The cubic root of 3666778 is about 154.2037276698.

It can be divided in two parts, 3666 and 778, that added together give a palindrome (4444).

The spelling of 3666778 in words is "three million, six hundred sixty-six thousand, seven hundred seventy-eight".