22081878 has 144 divisors (see below), whose sum is σ = 63719136. Its totient is φ = 5391360.

The previous prime is 22081877. The next prime is 22081897. The reversal of 22081878 is 87818022.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22081877) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 361968 + ... + 362028.

It is an arithmetic number, because the mean of its divisors is an integer number (442494).

Almost surely, 2^22081878 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 22081878, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31859568).

22081878 is an abundant number, since it is smaller than the sum of its proper divisors (41637258).

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

22081878 is a wasteful number, since it uses less digits than its factorization.

22081878 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 119 (or 103 counting only the distinct ones).

The product of its (nonzero) digits is 14336, while the sum is 36.

The square root of 22081878 is about 4699.1358780099. The cubic root of 22081878 is about 280.5511169198.

The spelling of 22081878 in words is "twenty-two million, eighty-one thousand, eight hundred seventy-eight".