22791072 has 48 divisors (see below), whose sum is σ = 60177600. Its totient is φ = 7552512.

The previous prime is 22791061. The next prime is 22791073. The reversal of 22791072 is 27019722.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (48).

It is not an unprimeable number, because it can be changed into a prime (22791073) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18508 + ... + 19700.

It is an arithmetic number, because the mean of its divisors is an integer number (1253700).

Almost surely, 2^22791072 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 22791072, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30088800).

22791072 is an abundant number, since it is smaller than the sum of its proper divisors (37386528).

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

22791072 is a wasteful number, since it uses less digits than its factorization.

22791072 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1405 (or 1397 counting only the distinct ones).

The product of its (nonzero) digits is 3528, while the sum is 30.

The square root of 22791072 is about 4773.9995810641. Note that the first 3 decimals coincide. The cubic root of 22791072 is about 283.5229709309.

The spelling of 22791072 in words is "twenty-two million, seven hundred ninety-one thousand, seventy-two".