22099728 has 160 divisors (see below), whose sum is σ = 71352576. Its totient is φ = 5750784.

The previous prime is 22099723. The next prime is 22099733. The reversal of 22099728 is 82799022.

It is an interprime number because it is at equal distance from previous prime (22099723) and next prime (22099733).

It is not an unprimeable number, because it can be changed into a prime (22099723) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 302700 + ... + 302772.

Almost surely, 2^22099728 is an apocalyptic number.

22099728 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 22099728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35676288).

22099728 is an abundant number, since it is smaller than the sum of its proper divisors (49252848).

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

22099728 is a wasteful number, since it uses less digits than its factorization.

22099728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 161 (or 155 counting only the distinct ones).

The product of its (nonzero) digits is 36288, while the sum is 39.

The square root of 22099728 is about 4701.0347797054. The cubic root of 22099728 is about 280.6266915406.

The spelling of 22099728 in words is "twenty-two million, ninety-nine thousand, seven hundred twenty-eight".