28660216 has 16 divisors (see below), whose sum is σ = 57871800. Its totient is φ = 13227744.

The previous prime is 28660211. The next prime is 28660223. The reversal of 28660216 is 61206682.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28660211) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 137686 + ... + 137893.

Almost surely, 2^28660216 is an apocalyptic number.

28660216 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

28660216 is an abundant number, since it is smaller than the sum of its proper divisors (29211584).

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

28660216 is a wasteful number, since it uses less digits than its factorization.

28660216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 275598 (or 275594 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 31.

The square root of 28660216 is about 5353.5236993965. The cubic root of 28660216 is about 306.0270527295.

Adding to 28660216 its reverse (61206682), we get a palindrome (89866898).

The spelling of 28660216 in words is "twenty-eight million, six hundred sixty thousand, two hundred sixteen".