16220428 has 48 divisors (see below), whose sum is σ = 34352640. Its totient is φ = 6551424.

The previous prime is 16220423. The next prime is 16220429. The reversal of 16220428 is 82402261.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (16220423) 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, 57175 + ... + 57457.

It is an arithmetic number, because the mean of its divisors is an integer number (715680).

Almost surely, 2^16220428 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 16220428, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (17176320).

16220428 is an abundant number, since it is smaller than the sum of its proper divisors (18132212).

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

16220428 is a wasteful number, since it uses less digits than its factorization.

16220428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 406 (or 404 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 25.

The square root of 16220428 is about 4027.4592487076. The cubic root of 16220428 is about 253.1361107352.

Adding to 16220428 its reverse (82402261), we get a palindrome (98622689).

The spelling of 16220428 in words is "sixteen million, two hundred twenty thousand, four hundred twenty-eight".