22978836 has 48 divisors (see below), whose sum is σ = 59875200. Its totient is φ = 7621056.

The previous prime is 22978831. The next prime is 22978861. The reversal of 22978836 is 63887922.

It is a junction number, because it is equal to n+sod(n) for n = 22978791 and 22978800.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22978831) 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 15 ways as a sum of consecutive naturals, for example, 28000 + ... + 28808.

It is an arithmetic number, because the mean of its divisors is an integer number (1247400).

Almost surely, 2^22978836 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 22978836, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29937600).

22978836 is an abundant number, since it is smaller than the sum of its proper divisors (36896364).

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

22978836 is a wasteful number, since it uses less digits than its factorization.

22978836 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1085 (or 1077 counting only the distinct ones).

The product of its digits is 290304, while the sum is 45.

The square root of 22978836 is about 4793.6245159587. The cubic root of 22978836 is about 284.2994428095.

The spelling of 22978836 in words is "twenty-two million, nine hundred seventy-eight thousand, eight hundred thirty-six".