201028140 has 144 divisors (see below), whose sum is σ = 629690880. Its totient is φ = 51891840.

The previous prime is 201028133. The next prime is 201028147. The reversal of 201028140 is 41820102.

It is an interprime number because it is at equal distance from previous prime (201028133) and next prime (201028147).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (201028147) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 952635 + ... + 952845.

Almost surely, 2^201028140 is an apocalyptic number.

201028140 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 201028140, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (314845440).

201028140 is an abundant number, since it is smaller than the sum of its proper divisors (428662740).

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

201028140 is a wasteful number, since it uses less digits than its factorization.

201028140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 372 (or 367 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

The square root of 201028140 is about 14178.4392653070. The cubic root of 201028140 is about 585.8039352308.

Adding to 201028140 its reverse (41820102), we get a palindrome (242848242).

The spelling of 201028140 in words is "two hundred one million, twenty-eight thousand, one hundred forty".