28873831 has 8 divisors (see below), whose sum is σ = 33259520. Its totient is φ = 24553368.

The previous prime is 28873811. The next prime is 28873849. The reversal of 28873831 is 13837882.

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

It is not a de Polignac number, because 28873831 - 2⁹ = 28873319 is a prime.

It is a super-2 number, since 2×28873831² = 1667396233233122, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28873811) 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, 15351 + ... + 17128.

It is an arithmetic number, because the mean of its divisors is an integer number (4157440).

Almost surely, 2^28873831 is an apocalyptic number.

28873831 is a deficient number, since it is larger than the sum of its proper divisors (4385689).

28873831 is a wasteful number, since it uses less digits than its factorization.

28873831 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32613.

The product of its digits is 64512, while the sum is 40.

The square root of 28873831 is about 5373.4375403460. The cubic root of 28873831 is about 306.7854818168.

The spelling of 28873831 in words is "twenty-eight million, eight hundred seventy-three thousand, eight hundred thirty-one".