22781952 has 112 divisors (see below), whose sum is σ = 68153280. Its totient is φ = 7520256.

The previous prime is 22781939. The next prime is 22781963. The reversal of 22781952 is 25918722.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 221133 + ... + 221235.

Almost surely, 2^22781952 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 22781952, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34076640).

22781952 is an abundant number, since it is smaller than the sum of its proper divisors (45371328).

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

22781952 is an equidigital number, since it uses as much as digits as its factorization.

22781952 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 138 (or 108 counting only the distinct ones).

The product of its digits is 20160, while the sum is 36.

The square root of 22781952 is about 4773.0443115479. The cubic root of 22781952 is about 283.4851480140.

The spelling of 22781952 in words is "twenty-two million, seven hundred eighty-one thousand, nine hundred fifty-two".