3778221694 has 32 divisors (see below), whose sum is σ = 6159154176. Its totient is φ = 1727900640.

The previous prime is 3778221691. The next prime is 3778221719. The reversal of 3778221694 is 4961228773.

It is a happy number.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3778221691) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1592329 + ... + 1594699.

It is an arithmetic number, because the mean of its divisors is an integer number (192473568).

Almost surely, 2^3778221694 is an apocalyptic number.

3778221694 is a deficient number, since it is larger than the sum of its proper divisors (2380932482).

3778221694 is a wasteful number, since it uses less digits than its factorization.

3778221694 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2920.

The product of its digits is 1016064, while the sum is 49.

The square root of 3778221694 is about 61467.2408198058. The cubic root of 3778221694 is about 1557.5039106659.

The spelling of 3778221694 in words is "three billion, seven hundred seventy-eight million, two hundred twenty-one thousand, six hundred ninety-four".