28532857 has 4 divisors (see below), whose sum is σ = 29773440. Its totient is φ = 27292276.

The previous prime is 28532837. The next prime is 28532869. The reversal of 28532857 is 75823582.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 28532857 - 2¹⁵ = 28500089 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28532837) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 620257 + ... + 620302.

It is an arithmetic number, because the mean of its divisors is an integer number (7443360).

Almost surely, 2^28532857 is an apocalyptic number.

It is an amenable number.

28532857 is a deficient number, since it is larger than the sum of its proper divisors (1240583).

28532857 is a wasteful number, since it uses less digits than its factorization.

28532857 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1240582.

The product of its digits is 134400, while the sum is 40.

The square root of 28532857 is about 5341.6155795789. The cubic root of 28532857 is about 305.5730764511.

The spelling of 28532857 in words is "twenty-eight million, five hundred thirty-two thousand, eight hundred fifty-seven".