63216540 has 144 divisors (see below), whose sum is σ = 206545248. Its totient is φ = 15593472.

The previous prime is 63216499. The next prime is 63216541. The reversal of 63216540 is 4561236.

63216540 is a `hidden beast` number, since 6 + 3 + 2 + 1 + 654 + 0 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (63216541) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 223239 + ... + 223521.

It is an arithmetic number, because the mean of its divisors is an integer number (1434342).

Almost surely, 2^63216540 is an apocalyptic number.

63216540 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 63216540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (103272624).

63216540 is an abundant number, since it is smaller than the sum of its proper divisors (143328708).

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

63216540 is a wasteful number, since it uses less digits than its factorization.

63216540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 388 (or 383 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 27.

The square root of 63216540 is about 7950.8829698342. The cubic root of 63216540 is about 398.3610857380.

Adding to 63216540 its reverse (4561236), we get a palindrome (67777776).

The spelling of 63216540 in words is "sixty-three million, two hundred sixteen thousand, five hundred forty".