22717072 has 80 divisors (see below), whose sum is σ = 53032320. Its totient is φ = 9225216.

The previous prime is 22717061. The next prime is 22717081. The reversal of 22717072 is 27071722.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a self number, because there is not a number n which added to its sum of digits gives 22717072.

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, 255204 + ... + 255292.

It is an arithmetic number, because the mean of its divisors is an integer number (662904).

Almost surely, 2^22717072 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 22717072, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26516160).

22717072 is an abundant number, since it is smaller than the sum of its proper divisors (30315248).

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

22717072 is a wasteful number, since it uses less digits than its factorization.

22717072 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 200 (or 194 counting only the distinct ones).

The product of its (nonzero) digits is 2744, while the sum is 28.

The square root of 22717072 is about 4766.2429648519. The cubic root of 22717072 is about 283.2157826862.

Adding to 22717072 its reverse (27071722), we get a palindrome (49788794).

The spelling of 22717072 in words is "twenty-two million, seven hundred seventeen thousand, seventy-two".