28662857 has 4 divisors (see below), whose sum is σ = 28768896. Its totient is φ = 28556820.

The previous prime is 28662791. The next prime is 28662869. The reversal of 28662857 is 75826682.

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 28662857 - 2¹⁶ = 28597321 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28667857) 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, 52613 + ... + 53154.

It is an arithmetic number, because the mean of its divisors is an integer number (7192224).

Almost surely, 2^28662857 is an apocalyptic number.

It is an amenable number.

28662857 is a deficient number, since it is larger than the sum of its proper divisors (106039).

28662857 is a wasteful number, since it uses less digits than its factorization.

28662857 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 106038.

The product of its digits is 322560, while the sum is 44.

The square root of 28662857 is about 5353.7703536853. The cubic root of 28662857 is about 306.0364524333.

The spelling of 28662857 in words is "twenty-eight million, six hundred sixty-two thousand, eight hundred fifty-seven".