22378816 has 42 divisors (see below), whose sum is σ = 46492922. Its totient is φ = 10686720.

The previous prime is 22378801. The next prime is 22378819. The reversal of 22378816 is 61887322.

It can be written as a sum of positive squares in only one way, i.e., 21160000 + 1218816 = 4600^2 + 1104^2 .

It is a super-2 number, since 2×22378816² = 1001622811123712, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22378819) 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 5 ways as a sum of consecutive naturals, for example, 33526 + ... + 34186.

Almost surely, 2^22378816 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 22378816, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23246461).

22378816 is an abundant number, since it is smaller than the sum of its proper divisors (24114106).

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

22378816 is an equidigital number, since it uses as much as digits as its factorization.

22378816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 719 (or 686 counting only the distinct ones).

The product of its digits is 32256, while the sum is 37.

The square root of 22378816 is about 4730.6253286431. The cubic root of 22378816 is about 281.8030581737.

The spelling of 22378816 in words is "twenty-two million, three hundred seventy-eight thousand, eight hundred sixteen".