28535670817 has 4 divisors (see below), whose sum is σ = 28896881920. Its totient is φ = 28174459716.

The previous prime is 28535670803. The next prime is 28535670833. The reversal of 28535670817 is 71807653582.

It is a happy number.

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 28535670817 - 2¹¹ = 28535668769 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28535670017) 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, 180605433 + ... + 180605590.

It is an arithmetic number, because the mean of its divisors is an integer number (7224220480).

Almost surely, 2^28535670817 is an apocalyptic number.

It is an amenable number.

28535670817 is a deficient number, since it is larger than the sum of its proper divisors (361211103).

28535670817 is an equidigital number, since it uses as much as digits as its factorization.

28535670817 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 361211102.

The product of its (nonzero) digits is 2822400, while the sum is 52.

The spelling of 28535670817 in words is "twenty-eight billion, five hundred thirty-five million, six hundred seventy thousand, eight hundred seventeen".