16222428 has 72 divisors (see below), whose sum is σ = 44400720. Its totient is φ = 4976640.

The previous prime is 16222421. The next prime is 16222439. The reversal of 16222428 is 82422261.

It is a happy number.

16222428 is a `hidden beast` number, since 16 + 222 + 428 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16222421) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 24988 + ... + 25628.

Almost surely, 2^16222428 is an apocalyptic number.

16222428 is a gapful number since it is divisible by the number (18) 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 16222428, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22200360).

16222428 is an abundant number, since it is smaller than the sum of its proper divisors (28178292).

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

16222428 is a wasteful number, since it uses less digits than its factorization.

16222428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 707 (or 702 counting only the distinct ones).

The product of its digits is 3072, while the sum is 27.

The square root of 16222428 is about 4027.7075365523. The cubic root of 16222428 is about 253.1465143122.

Adding to 16222428 its reverse (82422261), we get a palindrome (98644689).

The spelling of 16222428 in words is "sixteen million, two hundred twenty-two thousand, four hundred twenty-eight".