263721216 has 288 divisors, whose sum is σ = 847687680. Its totient is φ = 71884800.

The previous prime is 263721173. The next prime is 263721217. The reversal of 263721216 is 612127362.

It is a nialpdrome in base 16.

It is not an unprimeable number, because it can be changed into a prime (263721217) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4975846 + ... + 4975898.

It is an arithmetic number, because the mean of its divisors is an integer number (2943360).

Almost surely, 2^263721216 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 263721216, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (423843840).

263721216 is an abundant number, since it is smaller than the sum of its proper divisors (583966464).

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

263721216 is a wasteful number, since it uses less digits than its factorization.

263721216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 133 (or 119 counting only the distinct ones).

The product of its digits is 6048, while the sum is 30.

The square root of 263721216 is about 16239.4955586681. The cubic root of 263721216 is about 641.2809760504.

Adding to 263721216 its reverse (612127362), we get a palindrome (875848578).

The spelling of 263721216 in words is "two hundred sixty-three million, seven hundred twenty-one thousand, two hundred sixteen".