22051428 has 48 divisors (see below), whose sum is σ = 59566080. Its totient is φ = 6218784.

The previous prime is 22051423. The next prime is 22051433. The reversal of 22051428 is 82415022.

It is an interprime number because it is at equal distance from previous prime (22051423) and next prime (22051433).

It is a junction number, because it is equal to n+sod(n) for n = 22051398 and 22051407.

It is not an unprimeable number, because it can be changed into a prime (22051423) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4975 + ... + 8297.

It is an arithmetic number, because the mean of its divisors is an integer number (1240960).

Almost surely, 2^22051428 is an apocalyptic number.

22051428 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 22051428, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29783040).

22051428 is an abundant number, since it is smaller than the sum of its proper divisors (37514652).

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

22051428 is a wasteful number, since it uses less digits than its factorization.

22051428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3416 (or 3414 counting only the distinct ones).

The product of its (nonzero) digits is 1280, while the sum is 24.

The square root of 22051428 is about 4695.8948029103. The cubic root of 22051428 is about 280.4221014553.

The spelling of 22051428 in words is "twenty-two million, fifty-one thousand, four hundred twenty-eight".