22722784 has 72 divisors (see below), whose sum is σ = 54150768. Its totient is φ = 9192960.

The previous prime is 22722757. The next prime is 22722793. The reversal of 22722784 is 48722722.

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 80724 + ... + 81004.

It is an arithmetic number, because the mean of its divisors is an integer number (752094).

Almost surely, 2^22722784 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 22722784, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27075384).

22722784 is an abundant number, since it is smaller than the sum of its proper divisors (31427984).

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

22722784 is a wasteful number, since it uses less digits than its factorization.

22722784 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 336 (or 309 counting only the distinct ones).

The product of its digits is 25088, while the sum is 34.

The square root of 22722784 is about 4766.8421412923. The cubic root of 22722784 is about 283.2395180365.

The spelling of 22722784 in words is "twenty-two million, seven hundred twenty-two thousand, seven hundred eighty-four".