202128540 has 24 divisors (see below), whose sum is σ = 565960080. Its totient is φ = 53900928.

The previous prime is 202128527. The next prime is 202128547. The reversal of 202128540 is 45821202.

It is a self number, because there is not a number n which added to its sum of digits gives 202128540.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (202128547) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1684345 + ... + 1684464.

It is an arithmetic number, because the mean of its divisors is an integer number (23581670).

Almost surely, 2^202128540 is an apocalyptic number.

202128540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

202128540 is an abundant number, since it is smaller than the sum of its proper divisors (363831540).

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

202128540 is a wasteful number, since it uses less digits than its factorization.

202128540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3368821 (or 3368819 counting only the distinct ones).

The product of its (nonzero) digits is 1280, while the sum is 24.

The square root of 202128540 is about 14217.1917058187. The cubic root of 202128540 is about 586.8708605378.

Adding to 202128540 its reverse (45821202), we get a palindrome (247949742).

The spelling of 202128540 in words is "two hundred two million, one hundred twenty-eight thousand, five hundred forty".