22222578 has 48 divisors (see below), whose sum is σ = 52186464. Its totient is φ = 6289920.

The previous prime is 22222561. The next prime is 22222583. The reversal of 22222578 is 87522222.

It is a plaindrome in base 10.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 38226 + ... + 38802.

It is an arithmetic number, because the mean of its divisors is an integer number (1087218).

Almost surely, 2^22222578 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 22222578, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26093232).

22222578 is an abundant number, since it is smaller than the sum of its proper divisors (29963886).

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

22222578 is a wasteful number, since it uses less digits than its factorization.

22222578 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 727 (or 720 counting only the distinct ones).

The product of its digits is 8960, while the sum is 30.

The square root of 22222578 is about 4714.0829436912. The cubic root of 22222578 is about 281.1457221322.

The spelling of 22222578 in words is "twenty-two million, two hundred twenty-two thousand, five hundred seventy-eight".