28523887 has 8 divisors (see below), whose sum is σ = 34016256. Its totient is φ = 23385912.

The previous prime is 28523881. The next prime is 28523899. The reversal of 28523887 is 78832582.

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 28523887 - 2¹⁹ = 27999599 is a prime.

It is a super-2 number, since 2×28523887² = 1627224259177538, 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 (28523881) 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, 88423 + ... + 88744.

It is an arithmetic number, because the mean of its divisors is an integer number (4252032).

Almost surely, 2^28523887 is an apocalyptic number.

28523887 is a deficient number, since it is larger than the sum of its proper divisors (5492369).

28523887 is a wasteful number, since it uses less digits than its factorization.

28523887 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 177197.

The product of its digits is 215040, while the sum is 43.

The square root of 28523887 is about 5340.7758799635. The cubic root of 28523887 is about 305.5410516434.

The spelling of 28523887 in words is "twenty-eight million, five hundred twenty-three thousand, eight hundred eighty-seven".