201255640 has 32 divisors (see below), whose sum is σ = 453418560. Its totient is φ = 80396800.

The previous prime is 201255629. The next prime is 201255643. The reversal of 201255640 is 46552102.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201255643) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 32385 + ... + 38095.

It is an arithmetic number, because the mean of its divisors is an integer number (14169330).

Almost surely, 2^201255640 is an apocalyptic number.

201255640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

201255640 is an abundant number, since it is smaller than the sum of its proper divisors (252162920).

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

201255640 is a wasteful number, since it uses less digits than its factorization.

201255640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6603 (or 6599 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 25.

The square root of 201255640 is about 14186.4597415987. The cubic root of 201255640 is about 586.0248332497.

The spelling of 201255640 in words is "two hundred one million, two hundred fifty-five thousand, six hundred forty".