28227816 has 24 divisors (see below), whose sum is σ = 76450530. Its totient is φ = 9409248.

The previous prime is 28227799. The next prime is 28227821. The reversal of 28227816 is 61872282.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 26563716 + 1664100 = 5154^2 + 1290^2 .

It is a tau number, because it is divible by the number of its divisors (24).

It is a super-2 number, since 2×28227816² = 1593619192259712, which contains 22 as substring.

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

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 195955 + ... + 196098.

Almost surely, 2^28227816 is an apocalyptic number.

It is an amenable number.

28227816 is an abundant number, since it is smaller than the sum of its proper divisors (48222714).

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

28227816 is a wasteful number, since it uses less digits than its factorization.

28227816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 392065 (or 392058 counting only the distinct ones).

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

The square root of 28227816 is about 5312.9856013357. The cubic root of 28227816 is about 304.4802255272.

The spelling of 28227816 in words is "twenty-eight million, two hundred twenty-seven thousand, eight hundred sixteen".