23781216 has 96 divisors (see below), whose sum is σ = 65995776. Its totient is φ = 7488000.

The previous prime is 23781203. The next prime is 23781221. The reversal of 23781216 is 61218732.

It is a tau number, because it is divible by the number of its divisors (96).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 181471 + ... + 181601.

It is an arithmetic number, because the mean of its divisors is an integer number (687456).

Almost surely, 2^23781216 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 23781216, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32997888).

23781216 is an abundant number, since it is smaller than the sum of its proper divisors (42214560).

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

23781216 is a wasteful number, since it uses less digits than its factorization.

23781216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 236 (or 228 counting only the distinct ones).

The product of its digits is 4032, while the sum is 30.

The square root of 23781216 is about 4876.5988147478. The cubic root of 23781216 is about 287.5707339506.

Adding to 23781216 its reverse (61218732), we get a palindrome (84999948).

The spelling of 23781216 in words is "twenty-three million, seven hundred eighty-one thousand, two hundred sixteen".