201289640 has 32 divisors (see below), whose sum is σ = 453391560. Its totient is φ = 80428800.

The previous prime is 201289637. The next prime is 201289661. The reversal of 201289640 is 46982102.

201289640 is digitally balanced in base 3, 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 4 ways, for example, as 199883044 + 1406596 = 14138^2 + 1186^2 .

It is a junction number, because it is equal to n+sod(n) for n = 201289597 and 201289606.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 45110 + ... + 49370.

Almost surely, 2^201289640 is an apocalyptic number.

201289640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

201289640 is an abundant number, since it is smaller than the sum of its proper divisors (252101920).

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

201289640 is a wasteful number, since it uses less digits than its factorization.

201289640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5453 (or 5449 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 32.

The square root of 201289640 is about 14187.6580167412. The cubic root of 201289640 is about 586.0578322792.

The spelling of 201289640 in words is "two hundred one million, two hundred eighty-nine thousand, six hundred forty".