201280640 has 64 divisors (see below), whose sum is σ = 524949120. Its totient is φ = 73190400.

The previous prime is 201280621. The next prime is 201280657. The reversal of 201280640 is 46082102.

It is a tau number, because it is divible by the number of its divisors (64).

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, 7256 + ... + 21335.

It is an arithmetic number, because the mean of its divisors is an integer number (8202330).

Almost surely, 2^201280640 is an apocalyptic number.

201280640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

201280640 is an abundant number, since it is smaller than the sum of its proper divisors (323668480).

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

201280640 is a wasteful number, since it uses less digits than its factorization.

201280640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28621 (or 28609 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 23.

The square root of 201280640 is about 14187.3408361116. The cubic root of 201280640 is about 586.0490976036.

The spelling of 201280640 in words is "two hundred one million, two hundred eighty thousand, six hundred forty".