36885681 has 18 divisors (see below), whose sum is σ = 61978722. Its totient is φ = 21077280.

The previous prime is 36885671. The next prime is 36885683. The reversal of 36885681 is 18658863.

36885681 is a `hidden beast` number, since 3 + 6 + 88 + 568 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 18533025 + 18352656 = 4305^2 + 4284^2 .

It is not a de Polignac number, because 36885681 - 2⁵ = 36885649 is a prime.

It is a super-2 number, since 2×36885681² = 2721106925667522, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (36885683) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 41380 + ... + 42261.

Almost surely, 2^36885681 is an apocalyptic number.

It is an amenable number.

36885681 is a deficient number, since it is larger than the sum of its proper divisors (25093041).

36885681 is a wasteful number, since it uses less digits than its factorization.

36885681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83661 (or 83651 counting only the distinct ones).

The product of its digits is 276480, while the sum is 45.

The square root of 36885681 is about 6073.3582966922. The cubic root of 36885681 is about 332.8786452806.

The spelling of 36885681 in words is "thirty-six million, eight hundred eighty-five thousand, six hundred eighty-one".