3688889618 has 18 divisors (see below), whose sum is σ = 5625930933. Its totient is φ = 1814081280.

The previous prime is 3688889593. The next prime is 3688889621. The reversal of 3688889618 is 8169888863.

It can be written as a sum of positive squares in 2 ways, for example, as 2937965209 + 750924409 = 54203^2 + 27403^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=42947.

It is a super-2 number, since 2×3688889618² = 27215813227576371848, which contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 5754578 + ... + 5755218.

Almost surely, 2^3688889618 is an apocalyptic number.

3688889618 is a deficient number, since it is larger than the sum of its proper divisors (1937041315).

3688889618 is an frugal number, since it uses more digits than its factorization.

3688889618 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1418 (or 710 counting only the distinct ones).

The product of its digits is 31850496, while the sum is 65.

The square root of 3688889618 is about 60736.2298632373. The cubic root of 3688889618 is about 1545.1306945992.

The spelling of 3688889618 in words is "three billion, six hundred eighty-eight million, eight hundred eighty-nine thousand, six hundred eighteen".