28487631 has 16 divisors (see below), whose sum is σ = 42336000. Its totient is φ = 16933248.

The previous prime is 28487623. The next prime is 28487651. The reversal of 28487631 is 13678482.

It is not a de Polignac number, because 28487631 - 2³ = 28487623 is a prime.

It is a super-2 number, since 2×28487631² = 1623090239984322, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 28487631.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28487651) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13731 + ... + 15668.

It is an arithmetic number, because the mean of its divisors is an integer number (2646000).

Almost surely, 2^28487631 is an apocalyptic number.

28487631 is a deficient number, since it is larger than the sum of its proper divisors (13848369).

28487631 is a wasteful number, since it uses less digits than its factorization.

28487631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29438.

The product of its digits is 64512, while the sum is 39.

The square root of 28487631 is about 5337.3805373048. The cubic root of 28487631 is about 305.4115415569.

The spelling of 28487631 in words is "twenty-eight million, four hundred eighty-seven thousand, six hundred thirty-one".