202543540 has 48 divisors (see below), whose sum is σ = 443394000. Its totient is φ = 77622272.

The previous prime is 202543531. The next prime is 202543669. The reversal of 202543540 is 45345202.

It can be written as a sum of positive squares in 8 ways, for example, as 11329956 + 191213584 = 3366^2 + 13828^2 .

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 78186 + ... + 80734.

It is an arithmetic number, because the mean of its divisors is an integer number (9237375).

Almost surely, 2^202543540 is an apocalyptic number.

202543540 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 202543540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (221697000).

202543540 is an abundant number, since it is smaller than the sum of its proper divisors (240850460).

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

202543540 is a wasteful number, since it uses less digits than its factorization.

202543540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2724 (or 2722 counting only the distinct ones).

The product of its (nonzero) digits is 4800, while the sum is 25.

The square root of 202543540 is about 14231.7792281921. The cubic root of 202543540 is about 587.2722304030.

Adding to 202543540 its reverse (45345202), we get a palindrome (247888742).

The spelling of 202543540 in words is "two hundred two million, five hundred forty-three thousand, five hundred forty".