22532778 has 48 divisors (see below), whose sum is σ = 52356096. Its totient is φ = 6985440.

The previous prime is 22532771. The next prime is 22532789. The reversal of 22532778 is 87723522.

It is a happy number.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (22532771) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 14583 + ... + 16053.

It is an arithmetic number, because the mean of its divisors is an integer number (1090752).

Almost surely, 2^22532778 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 22532778, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26178048).

22532778 is an abundant number, since it is smaller than the sum of its proper divisors (29823318).

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

22532778 is a wasteful number, since it uses less digits than its factorization.

22532778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1539 (or 1536 counting only the distinct ones).

The product of its digits is 47040, while the sum is 36.

The square root of 22532778 is about 4746.8703373907. The cubic root of 22532778 is about 282.4478322759.

The spelling of 22532778 in words is "twenty-two million, five hundred thirty-two thousand, seven hundred seventy-eight".