201809864 has 16 divisors (see below), whose sum is σ = 381743820. Its totient is φ = 100011520.

The previous prime is 201809851. The next prime is 201809891. The reversal of 201809864 is 468908102.

201809864 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 159012100 + 42797764 = 12610^2 + 6542^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 110717 + ... + 112524.

Almost surely, 2^201809864 is an apocalyptic number.

It is an amenable number.

201809864 is a deficient number, since it is larger than the sum of its proper divisors (179933956).

201809864 is a wasteful number, since it uses less digits than its factorization.

201809864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 223360 (or 223356 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 38.

The square root of 201809864 is about 14205.9798676473. The cubic root of 201809864 is about 586.5622779717.

The spelling of 201809864 in words is "two hundred one million, eight hundred nine thousand, eight hundred sixty-four".