63021240 has 160 divisors (see below), whose sum is σ = 216406080. Its totient is φ = 16443648.

The previous prime is 63021229. The next prime is 63021241. The reversal of 63021240 is 4212036.

It is a happy number.

It is a super-2 number, since 2×63021240² = 7943353382275200, which contains 22 as substring.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (63021241) by changing a digit.

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 39 ways as a sum of consecutive naturals, for example, 171537 + ... + 171903.

It is an arithmetic number, because the mean of its divisors is an integer number (1352538).

Almost surely, 2^63021240 is an apocalyptic number.

63021240 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 63021240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (108203040).

63021240 is an abundant number, since it is smaller than the sum of its proper divisors (153384840).

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

63021240 is a wasteful number, since it uses less digits than its factorization.

63021240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 443 (or 430 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

The square root of 63021240 is about 7938.5918146734. The cubic root of 63021240 is about 397.9504327891.

Adding to 63021240 its reverse (4212036), we get a palindrome (67233276).

The spelling of 63021240 in words is "sixty-three million, twenty-one thousand, two hundred forty".