28187936 has 36 divisors (see below), whose sum is σ = 64558998. Its totient is φ = 12079872.

The previous prime is 28187933. The next prime is 28187941. The reversal of 28187936 is 63978182.

It can be written as a sum of positive squares in only one way, i.e., 24010000 + 4177936 = 4900^2 + 2044^2 .

It is not an unprimeable number, because it can be changed into a prime (28187933) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 7421 + ... + 10556.

Almost surely, 2^28187936 is an apocalyptic number.

It is an amenable number.

28187936 is an abundant number, since it is smaller than the sum of its proper divisors (36371062).

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

28187936 is a wasteful number, since it uses less digits than its factorization.

28187936 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18001 (or 17986 counting only the distinct ones).

The product of its digits is 145152, while the sum is 44.

The square root of 28187936 is about 5309.2312061164. The cubic root of 28187936 is about 304.3367689896.

The spelling of 28187936 in words is "twenty-eight million, one hundred eighty-seven thousand, nine hundred thirty-six".