201640680 has 48 divisors (see below), whose sum is σ = 655333380. Its totient is φ = 53770752.

The previous prime is 201640679. The next prime is 201640687. The reversal of 201640680 is 86046102.

It can be written as a sum of positive squares in 2 ways, for example, as 178543044 + 23097636 = 13362^2 + 4806^2 .

It is not an unprimeable number, because it can be changed into a prime (201640687) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 279697 + ... + 280416.

Almost surely, 2^201640680 is an apocalyptic number.

201640680 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

201640680 is an abundant number, since it is smaller than the sum of its proper divisors (453692700).

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

201640680 is a wasteful number, since it uses less digits than its factorization.

201640680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 560130 (or 560123 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 27.

The square root of 201640680 is about 14200.0239436418. The cubic root of 201640680 is about 586.3983205142.

Adding to 201640680 its reverse (86046102), we get a palindrome (287686782).

The spelling of 201640680 in words is "two hundred one million, six hundred forty thousand, six hundred eighty".