201640256 has 28 divisors (see below), whose sum is σ = 401532852. Its totient is φ = 100466688.

The previous prime is 201640253. The next prime is 201640273. The reversal of 201640256 is 652046102.

It can be written as a sum of positive squares in 2 ways, for example, as 190881856 + 10758400 = 13816^2 + 3280^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201640253) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13376 + ... + 24128.

It is an arithmetic number, because the mean of its divisors is an integer number (14340459).

Almost surely, 2^201640256 is an apocalyptic number.

It is an amenable number.

201640256 is a deficient number, since it is larger than the sum of its proper divisors (199892596).

201640256 is a wasteful number, since it uses less digits than its factorization.

201640256 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11058 (or 11048 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 26.

The square root of 201640256 is about 14200.0090140816. The cubic root of 201640256 is about 586.3979094975.

Adding to 201640256 its reverse (652046102), we get a palindrome (853686358).

The spelling of 201640256 in words is "two hundred one million, six hundred forty thousand, two hundred fifty-six".