28866631 has 8 divisors (see below), whose sum is σ = 29613584. Its totient is φ = 28123200.

The previous prime is 28866599. The next prime is 28866637. The reversal of 28866631 is 13666882.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 28866631 - 2⁵ = 28866599 is a prime.

It is a super-2 number, since 2×28866631² = 1666564770580322, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28866637) 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 7 ways as a sum of consecutive naturals, for example, 25285 + ... + 26401.

It is an arithmetic number, because the mean of its divisors is an integer number (3701698).

Almost surely, 2^28866631 is an apocalyptic number.

28866631 is a deficient number, since it is larger than the sum of its proper divisors (746953).

28866631 is a wasteful number, since it uses less digits than its factorization.

28866631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1761.

The product of its digits is 82944, while the sum is 40.

The square root of 28866631 is about 5372.7675363820. The cubic root of 28866631 is about 306.7599796115.

The spelling of 28866631 in words is "twenty-eight million, eight hundred sixty-six thousand, six hundred thirty-one".