28087156 has 6 divisors (see below), whose sum is σ = 49152530. Its totient is φ = 14043576.

The previous prime is 28087141. The next prime is 28087159. The reversal of 28087156 is 65178082.

It can be written as a sum of positive squares in only one way, i.e., 18576100 + 9511056 = 4310^2 + 3084^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28087159) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3510891 + ... + 3510898.

Almost surely, 2^28087156 is an apocalyptic number.

It is an amenable number.

28087156 is a deficient number, since it is larger than the sum of its proper divisors (21065374).

28087156 is a wasteful number, since it uses less digits than its factorization.

28087156 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7021793 (or 7021791 counting only the distinct ones).

The product of its (nonzero) digits is 26880, while the sum is 37.

The square root of 28087156 is about 5299.7316913217. The cubic root of 28087156 is about 303.9736386421.

The spelling of 28087156 in words is "twenty-eight million, eighty-seven thousand, one hundred fifty-six".