22161280 has 64 divisors (see below), whose sum is σ = 54737280. Its totient is φ = 8570880.

The previous prime is 22161241. The next prime is 22161281. The reversal of 22161280 is 8216122.

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

It is a super-2 number, since 2×22161280² = 982244662476800, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22161281) 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, 19282 + ... + 20398.

It is an arithmetic number, because the mean of its divisors is an integer number (855270).

Almost surely, 2^22161280 is an apocalyptic number.

22161280 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 22161280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27368640).

22161280 is an abundant number, since it is smaller than the sum of its proper divisors (32576000).

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

22161280 is a wasteful number, since it uses less digits than its factorization.

22161280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1167 (or 1155 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 22.

The square root of 22161280 is about 4707.5768713851. The cubic root of 22161280 is about 280.8869831688.

The spelling of 22161280 in words is "twenty-two million, one hundred sixty-one thousand, two hundred eighty".