28871693 has 8 divisors (see below), whose sum is σ = 30181248. Its totient is φ = 27566704.

The previous prime is 28871683. The next prime is 28871737. The reversal of 28871693 is 39617882.

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 28871693 - 2¹⁰ = 28870669 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28871603) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21971 + ... + 23247.

It is an arithmetic number, because the mean of its divisors is an integer number (3772656).

Almost surely, 2^28871693 is an apocalyptic number.

28871693 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

It is an amenable number.

28871693 is a deficient number, since it is larger than the sum of its proper divisors (1309555).

28871693 is a wasteful number, since it uses less digits than its factorization.

28871693 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2283.

The product of its digits is 145152, while the sum is 44.

The square root of 28871693 is about 5373.2385951119. The cubic root of 28871693 is about 306.7779095212. Note that the first 3 decimals are identical.

The spelling of 28871693 in words is "twenty-eight million, eight hundred seventy-one thousand, six hundred ninety-three".