23781366 has 72 divisors (see below), whose sum is σ = 61088040. Its totient is φ = 6664896.

The previous prime is 23781349. The next prime is 23781367. The reversal of 23781366 is 66318732.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 23781366.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23781367) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 51810 + ... + 52266.

It is an arithmetic number, because the mean of its divisors is an integer number (848445).

Almost surely, 2^23781366 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 23781366, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30544020).

23781366 is an abundant number, since it is smaller than the sum of its proper divisors (37306674).

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

23781366 is a wasteful number, since it uses less digits than its factorization.

23781366 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 538 (or 528 counting only the distinct ones).

The product of its digits is 36288, while the sum is 36.

The square root of 23781366 is about 4876.6141942951. The cubic root of 23781366 is about 287.5713385667.

The spelling of 23781366 in words is "twenty-three million, seven hundred eighty-one thousand, three hundred sixty-six".