28859631 has 4 divisors (see below), whose sum is σ = 38479512. Its totient is φ = 19239752.

The previous prime is 28859629. The next prime is 28859671. The reversal of 28859631 is 13695882.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 28859631 - 2¹ = 28859629 is a prime.

It is a super-2 number, since 2×28859631² = 1665756602912322, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28859671) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4809936 + ... + 4809941.

It is an arithmetic number, because the mean of its divisors is an integer number (9619878).

Almost surely, 2^28859631 is an apocalyptic number.

28859631 is a deficient number, since it is larger than the sum of its proper divisors (9619881).

28859631 is an equidigital number, since it uses as much as digits as its factorization.

28859631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9619880.

The product of its digits is 103680, while the sum is 42.

The square root of 28859631 is about 5372.1160635266. The cubic root of 28859631 is about 306.7351817350.

The spelling of 28859631 in words is "twenty-eight million, eight hundred fifty-nine thousand, six hundred thirty-one".