63243540 has 72 divisors (see below), whose sum is σ = 196324128. Its totient is φ = 16470720.

The previous prime is 63243539. The next prime is 63243559. The reversal of 63243540 is 4534236.

63243540 = 430² + 431² + ... + 645².

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3655 + ... + 11825.

It is an arithmetic number, because the mean of its divisors is an integer number (2726724).

Almost surely, 2^63243540 is an apocalyptic number.

63243540 is a gapful number since it is divisible by the number (60) 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 63243540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (98162064).

63243540 is an abundant number, since it is smaller than the sum of its proper divisors (133080588).

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

63243540 is a wasteful number, since it uses less digits than its factorization.

63243540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8229 (or 8224 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 27.

The square root of 63243540 is about 7952.5807132025. The cubic root of 63243540 is about 398.4177914588.

Adding to 63243540 its reverse (4534236), we get a palindrome (67777776).

The spelling of 63243540 in words is "sixty-three million, two hundred forty-three thousand, five hundred forty".