28531385 has 8 divisors (see below), whose sum is σ = 35726400. Its totient is φ = 21832624.

The previous prime is 28531379. The next prime is 28531387. The reversal of 28531385 is 58313582.

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 28531385 - 2¹⁰ = 28530361 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28531387) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 123935 + ... + 124164.

It is an arithmetic number, because the mean of its divisors is an integer number (4465800).

Almost surely, 2^28531385 is an apocalyptic number.

It is an amenable number.

28531385 is a deficient number, since it is larger than the sum of its proper divisors (7195015).

28531385 is a wasteful number, since it uses less digits than its factorization.

28531385 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 248127.

The product of its digits is 28800, while the sum is 35.

The square root of 28531385 is about 5341.4777917726. The cubic root of 28531385 is about 305.5678215584.

The spelling of 28531385 in words is "twenty-eight million, five hundred thirty-one thousand, three hundred eighty-five".