22778550 has 96 divisors (see below), whose sum is σ = 64281600. Its totient is φ = 5928480.

The previous prime is 22778537. The next prime is 22778551. The reversal of 22778550 is 5587722.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22778551) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 63271 + ... + 63629.

It is an arithmetic number, because the mean of its divisors is an integer number (669600).

Almost surely, 2^22778550 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 22778550, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32140800).

22778550 is an abundant number, since it is smaller than the sum of its proper divisors (41503050).

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

22778550 is a wasteful number, since it uses less digits than its factorization.

22778550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 427 (or 416 counting only the distinct ones).

The product of its (nonzero) digits is 39200, while the sum is 36.

The square root of 22778550 is about 4772.6879219157. The cubic root of 22778550 is about 283.4710364857.

The spelling of 22778550 in words is "twenty-two million, seven hundred seventy-eight thousand, five hundred fifty".