28131023 has 8 divisors (see below), whose sum is σ = 28703760. Its totient is φ = 27561600.

The previous prime is 28131013. The next prime is 28131041. The reversal of 28131023 is 32013182.

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 28131023 - 2¹⁰ = 28129999 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 28130986 and 28131004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28131013) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22823 + ... + 24023.

It is an arithmetic number, because the mean of its divisors is an integer number (3587970).

Almost surely, 2^28131023 is an apocalyptic number.

28131023 is a deficient number, since it is larger than the sum of its proper divisors (572737).

28131023 is a wasteful number, since it uses less digits than its factorization.

28131023 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1657.

The product of its (nonzero) digits is 288, while the sum is 20.

The square root of 28131023 is about 5303.8686823865. The cubic root of 28131023 is about 304.1318067345.

The spelling of 28131023 in words is "twenty-eight million, one hundred thirty-one thousand, twenty-three".