3647855538 has 48 divisors (see below), whose sum is σ = 8221613400. Its totient is φ = 1167505920.

The previous prime is 3647855527. The next prime is 3647855551. The reversal of 3647855538 is 8355587463.

3647855538 is a `hidden beast` number, since 3 + 6 + 4 + 7 + 85 + 553 + 8 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 1652178609 + 1995676929 = 40647^2 + 44673^2 .

It is a super-2 number, since 2×3647855538² = 26613700052234538888, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 75178 + ... + 113786.

Almost surely, 2^3647855538 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 3647855538, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4110806700).

3647855538 is an abundant number, since it is smaller than the sum of its proper divisors (4573757862).

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

3647855538 is a wasteful number, since it uses less digits than its factorization.

3647855538 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38827 (or 38824 counting only the distinct ones).

The product of its digits is 12096000, while the sum is 54.

The square root of 3647855538 is about 60397.4795666177. The cubic root of 3647855538 is about 1539.3801319877.

The spelling of 3647855538 in words is "three billion, six hundred forty-seven million, eight hundred fifty-five thousand, five hundred thirty-eight".