28228616 has 16 divisors (see below), whose sum is σ = 57000300. Its totient is φ = 13028544.

The previous prime is 28228573. The next prime is 28228621. The reversal of 28228616 is 61682282.

It can be written as a sum of positive squares in 2 ways, for example, as 27604516 + 624100 = 5254^2 + 790^2 .

It is a super-2 number, since 2×28228616² = 1593709522550912, which contains 22 as substring.

It is a Smith number, since the sum of its digits (35) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 135611 + ... + 135818.

Almost surely, 2^28228616 is an apocalyptic number.

28228616 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

28228616 is an abundant number, since it is smaller than the sum of its proper divisors (28771684).

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

28228616 is a wasteful number, since it uses less digits than its factorization.

28228616 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 271448 (or 271444 counting only the distinct ones).

The product of its digits is 18432, while the sum is 35.

The square root of 28228616 is about 5313.0608880381. The cubic root of 28228616 is about 304.4831019084.

The spelling of 28228616 in words is "twenty-eight million, two hundred twenty-eight thousand, six hundred sixteen".