22078889 has 16 divisors (see below), whose sum is σ = 26545920. Its totient is φ = 17962560.

The previous prime is 22078883. The next prime is 22078897. The reversal of 22078889 is 98887022.

It is not a de Polignac number, because 22078889 - 2⁸ = 22078633 is a prime.

It is a Smith number, since the sum of its digits (44) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (22078883) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11492 + ... + 13274.

It is an arithmetic number, because the mean of its divisors is an integer number (1659120).

Almost surely, 2^22078889 is an apocalyptic number.

22078889 is a gapful number since it is divisible by the number (29) formed by its first and last digit.

It is an amenable number.

22078889 is a deficient number, since it is larger than the sum of its proper divisors (4467031).

22078889 is a wasteful number, since it uses less digits than its factorization.

22078889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1880.

The product of its (nonzero) digits is 129024, while the sum is 44.

The square root of 22078889 is about 4698.8178300504. The cubic root of 22078889 is about 280.5384578949.

The spelling of 22078889 in words is "twenty-two million, seventy-eight thousand, eight hundred eighty-nine".