3687778 has 4 divisors (see below), whose sum is σ = 5531670. Its totient is φ = 1843888.

The previous prime is 3687769. The next prime is 3687787. The reversal of 3687778 is 8777863.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 8777863 = 227 ⋅38669.

It is an interprime number because it is at equal distance from previous prime (3687769) and next prime (3687787).

It can be written as a sum of positive squares in only one way, i.e., 3583449 + 104329 = 1893^2 + 323^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 921943 + ... + 921946.

Almost surely, 2^3687778 is an apocalyptic number.

3687778 is a deficient number, since it is larger than the sum of its proper divisors (1843892).

3687778 is a wasteful number, since it uses less digits than its factorization.

3687778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1843891.

The product of its digits is 395136, while the sum is 46.

The square root of 3687778 is about 1920.3588206374. The cubic root of 3687778 is about 154.4975474662.

It can be divided in two parts, 3687 and 778, that added together give a triangular number (4465 = T₉₄).

The spelling of 3687778 in words is "three million, six hundred eighty-seven thousand, seven hundred seventy-eight".