28182987 has 18 divisors (see below), whose sum is σ = 47355828. Its totient is φ = 16104312.

The previous prime is 28182971. The next prime is 28182989. The reversal of 28182987 is 78928182.

It is a happy number.

It is not a de Polignac number, because 28182987 - 2⁴ = 28182971 is a prime.

It is a super-3 number, since 3×28182987³ (a number of 23 digits) contains 333 as substring.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (28182989) 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 in 17 ways as a sum of consecutive naturals, for example, 31513 + ... + 32394.

Almost surely, 2^28182987 is an apocalyptic number.

28182987 is a deficient number, since it is larger than the sum of its proper divisors (19172841).

28182987 is a wasteful number, since it uses less digits than its factorization.

28182987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63927 (or 63917 counting only the distinct ones).

The product of its digits is 129024, while the sum is 45.

The square root of 28182987 is about 5308.7651106448. The cubic root of 28182987 is about 304.3189569863.

The spelling of 28182987 in words is "twenty-eight million, one hundred eighty-two thousand, nine hundred eighty-seven".