201028440 has 64 divisors (see below), whose sum is σ = 617126400. Its totient is φ = 52359552.

The previous prime is 201028433. The next prime is 201028501. The reversal of 201028440 is 44820102.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14320 + ... + 24639.

It is an arithmetic number, because the mean of its divisors is an integer number (9642600).

Almost surely, 2^201028440 is an apocalyptic number.

201028440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

201028440 is an abundant number, since it is smaller than the sum of its proper divisors (416097960).

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

201028440 is a wasteful number, since it uses less digits than its factorization.

201028440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39016 (or 39012 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 21.

The square root of 201028440 is about 14178.4498447468. The cubic root of 201028440 is about 585.8042266346.

Adding to 201028440 its reverse (44820102), we get a palindrome (245848542).

The spelling of 201028440 in words is "two hundred one million, twenty-eight thousand, four hundred forty".