22991488 has 64 divisors (see below), whose sum is σ = 50679720. Its totient is φ = 10321920.

The previous prime is 22991483. The next prime is 22991503. The reversal of 22991488 is 88419922.

It can be written as a sum of positive squares in 4 ways, for example, as 6927424 + 16064064 = 2632^2 + 4008^2 .

It is a tau number, because it is divible by the number of its divisors (64).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22991483) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 68056 + ... + 68392.

Almost surely, 2^22991488 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 22991488, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25339860).

22991488 is an abundant number, since it is smaller than the sum of its proper divisors (27688232).

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

22991488 is a wasteful number, since it uses less digits than its factorization.

22991488 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 405 (or 393 counting only the distinct ones).

The product of its digits is 82944, while the sum is 43.

The square root of 22991488 is about 4794.9440038440. The cubic root of 22991488 is about 284.3516110539.

The spelling of 22991488 in words is "twenty-two million, nine hundred ninety-one thousand, four hundred eighty-eight".