16228728 has 32 divisors (see below), whose sum is σ = 45080400. Its totient is φ = 5409504.

The previous prime is 16228687. The next prime is 16228747. The reversal of 16228728 is 82782261.

It is a happy number.

16228728 is a `hidden beast` number, since 1 + 622 + 8 + 7 + 28 = 666.

It is a super-2 number, since 2×16228728² = 526743224995968, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 16228692 and 16228701.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 37351 + ... + 37782.

Almost surely, 2^16228728 is an apocalyptic number.

16228728 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

16228728 is an abundant number, since it is smaller than the sum of its proper divisors (28851672).

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

16228728 is a wasteful number, since it uses less digits than its factorization.

16228728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 75148 (or 75138 counting only the distinct ones).

The product of its digits is 21504, while the sum is 36.

The square root of 16228728 is about 4028.4895432407. The cubic root of 16228728 is about 253.1792799918.

The spelling of 16228728 in words is "sixteen million, two hundred twenty-eight thousand, seven hundred twenty-eight".