28857403009 has 4 divisors (see below), whose sum is σ = 28857779716. Its totient is φ = 28857026304.

The previous prime is 28857402991. The next prime is 28857403021. The reversal of 28857403009 is 90030475882.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 27798225984 + 1059177025 = 166728^2 + 32545^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28857403009 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 28857403009.

It is not an unprimeable number, because it can be changed into a prime (28857433009) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 27864 + ... + 241849.

It is an arithmetic number, because the mean of its divisors is an integer number (7214444929).

Almost surely, 2^28857403009 is an apocalyptic number.

It is an amenable number.

28857403009 is a deficient number, since it is larger than the sum of its proper divisors (376707).

28857403009 is a wasteful number, since it uses less digits than its factorization.

28857403009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 376706.

The product of its (nonzero) digits is 483840, while the sum is 46.

The spelling of 28857403009 in words is "twenty-eight billion, eight hundred fifty-seven million, four hundred three thousand, nine".