22778784 has 72 divisors (see below), whose sum is σ = 74037600. Its totient is φ = 6507648.

The previous prime is 22778783. The next prime is 22778797. The reversal of 22778784 is 48787722.

It is a tau number, because it is divible by the number of its divisors (72).

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is a nude number because it is divisible by every one of its digits.

It is a nialpdrome in base 12.

It is not an unprimeable number, because it can be changed into a prime (22778783) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3634 + ... + 7665.

It is an arithmetic number, because the mean of its divisors is an integer number (1028300).

Almost surely, 2^22778784 is an apocalyptic number.

22778784 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

22778784 is an abundant number, since it is smaller than the sum of its proper divisors (51258816).

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

22778784 is a wasteful number, since it uses less digits than its factorization.

22778784 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11322 (or 11311 counting only the distinct ones).

The product of its digits is 351232, while the sum is 45.

The square root of 22778784 is about 4772.7124363406. The cubic root of 22778784 is about 283.4720071649.

The spelling of 22778784 in words is "twenty-two million, seven hundred seventy-eight thousand, seven hundred eighty-four".