3778644 has 24 divisors (see below), whose sum is σ = 9281440. Its totient is φ = 1193184.

The previous prime is 3778637. The next prime is 3778651. The reversal of 3778644 is 4468773.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (3778637) and next prime (3778651).

It is a Smith number, since the sum of its digits (39) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8059 + ... + 8514.

Almost surely, 2^3778644 is an apocalyptic number.

It is an amenable number.

3778644 is an abundant number, since it is smaller than the sum of its proper divisors (5502796).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

3778644 is a wasteful number, since it uses less digits than its factorization.

3778644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16599 (or 16597 counting only the distinct ones).

The product of its digits is 112896, while the sum is 39.

The square root of 3778644 is about 1943.8734526712. The cubic root of 3778644 is about 155.7561937854.

The spelling of 3778644 in words is "three million, seven hundred seventy-eight thousand, six hundred forty-four".