22388778 has 16 divisors (see below), whose sum is σ = 49752960. Its totient is φ = 7462908.

The previous prime is 22388761. The next prime is 22388791. The reversal of 22388778 is 87788322.

It is a zygodrome in base 4.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 207250 + ... + 207357.

It is an arithmetic number, because the mean of its divisors is an integer number (3109560).

Almost surely, 2^22388778 is an apocalyptic number.

22388778 is an abundant number, since it is smaller than the sum of its proper divisors (27364182).

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

22388778 is a wasteful number, since it uses less digits than its factorization.

22388778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 414618 (or 414612 counting only the distinct ones).

The product of its digits is 301056, while the sum is 45.

The square root of 22388778 is about 4731.6781378281. The cubic root of 22388778 is about 281.8448671417.

The spelling of 22388778 in words is "twenty-two million, three hundred eighty-eight thousand, seven hundred seventy-eight".