16404228 has 48 divisors (see below), whose sum is σ = 42804160. Its totient is φ = 5432832.

The previous prime is 16404197. The next prime is 16404229. The reversal of 16404228 is 82240461.

16404228 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (16404229) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 20451 + ... + 21237.

Almost surely, 2^16404228 is an apocalyptic number.

16404228 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 16404228, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21402080).

16404228 is an abundant number, since it is smaller than the sum of its proper divisors (26399932).

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

16404228 is a wasteful number, since it uses less digits than its factorization.

16404228 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 993 (or 985 counting only the distinct ones).

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

The square root of 16404228 is about 4050.2133277150. The cubic root of 16404228 is about 254.0886499003.

Adding to 16404228 its reverse (82240461), we get a palindrome (98644689).

The spelling of 16404228 in words is "sixteen million, four hundred four thousand, two hundred twenty-eight".