28859431 has 4 divisors (see below), whose sum is σ = 29079864. Its totient is φ = 28639000.

The previous prime is 28859417. The next prime is 28859443. The reversal of 28859431 is 13495882.

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 28859431 - 2⁹ = 28858919 is a prime.

It is a super-2 number, since 2×28859431² = 1665733515287522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28859471) 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 3 ways as a sum of consecutive naturals, for example, 110020 + ... + 110281.

It is an arithmetic number, because the mean of its divisors is an integer number (7269966).

Almost surely, 2^28859431 is an apocalyptic number.

28859431 is a deficient number, since it is larger than the sum of its proper divisors (220433).

28859431 is a wasteful number, since it uses less digits than its factorization.

28859431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 220432.

The product of its digits is 69120, while the sum is 40.

The square root of 28859431 is about 5372.0974488555. The cubic root of 28859431 is about 306.7344731653.

The spelling of 28859431 in words is "twenty-eight million, eight hundred fifty-nine thousand, four hundred thirty-one".