28216008 has 24 divisors (see below), whose sum is σ = 76418550. Its totient is φ = 9405312.

The previous prime is 28216003. The next prime is 28216031. The reversal of 28216008 is 80061282.

It can be written as a sum of positive squares in only one way, i.e., 26193924 + 2022084 = 5118^2 + 1422^2 .

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

It is a super-2 number, since 2×28216008² = 1592286214912128, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (28216003) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 195873 + ... + 196016.

Almost surely, 2^28216008 is an apocalyptic number.

It is an amenable number.

28216008 is an abundant number, since it is smaller than the sum of its proper divisors (48202542).

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

28216008 is a wasteful number, since it uses less digits than its factorization.

28216008 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 391901 (or 391894 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 27.

The square root of 28216008 is about 5311.8742454994. The cubic root of 28216008 is about 304.4377638180.

It can be divided in two parts, 282 and 16008, that added together give a triangular number (16290 = T₁₈₀).

The spelling of 28216008 in words is "twenty-eight million, two hundred sixteen thousand, eight".