28406216 has 16 divisors (see below), whose sum is σ = 56065200. Its totient is φ = 13455504.

The previous prime is 28406207. The next prime is 28406233. The reversal of 28406216 is 61260482.

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, 93290 + ... + 93593.

It is an arithmetic number, because the mean of its divisors is an integer number (3504075).

Almost surely, 2^28406216 is an apocalyptic number.

It is an amenable number.

28406216 is a deficient number, since it is larger than the sum of its proper divisors (27658984).

28406216 is a wasteful number, since it uses less digits than its factorization.

28406216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 186908 (or 186904 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 29.

The square root of 28406216 is about 5329.7482116888. The cubic root of 28406216 is about 305.1203180232.

Adding to 28406216 its reverse (61260482), we get a palindrome (89666698).

The spelling of 28406216 in words is "twenty-eight million, four hundred six thousand, two hundred sixteen".