201688686 has 48 divisors (see below), whose sum is σ = 461869200. Its totient is φ = 63431424.

The previous prime is 201688681. The next prime is 201688733. The reversal of 201688686 is 686886102.

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201688681) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 93670 + ... + 95798.

It is an arithmetic number, because the mean of its divisors is an integer number (9622275).

Almost surely, 2^201688686 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 201688686, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (230934600).

201688686 is an abundant number, since it is smaller than the sum of its proper divisors (260180514).

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

201688686 is a wasteful number, since it uses less digits than its factorization.

201688686 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2433 (or 2430 counting only the distinct ones).

The product of its (nonzero) digits is 221184, while the sum is 45.

The square root of 201688686 is about 14201.7141923079. The cubic root of 201688686 is about 586.4448527980. Note that the first 3 decimals are identical.

The spelling of 201688686 in words is "two hundred one million, six hundred eighty-eight thousand, six hundred eighty-six".