28531855 has 8 divisors (see below), whose sum is σ = 37350864. Its totient is φ = 20750400.

The previous prime is 28531849. The next prime is 28531907. The reversal of 28531855 is 55813582.

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

It is not a de Polignac number, because 28531855 - 2⁵ = 28531823 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 259326 + ... + 259435.

It is an arithmetic number, because the mean of its divisors is an integer number (4668858).

Almost surely, 2^28531855 is an apocalyptic number.

28531855 is a deficient number, since it is larger than the sum of its proper divisors (8819009).

28531855 is a wasteful number, since it uses less digits than its factorization.

28531855 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 518777.

The product of its digits is 48000, while the sum is 37.

The square root of 28531855 is about 5341.5217869068. The cubic root of 28531855 is about 305.5694994310.

The spelling of 28531855 in words is "twenty-eight million, five hundred thirty-one thousand, eight hundred fifty-five".