28172823857 has 8 divisors (see below), whose sum is σ = 29661281760. Its totient is φ = 26684933760.

The previous prime is 28172823853. The next prime is 28172823871. The reversal of 28172823857 is 75832827182.

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

It is a cyclic number.

It is not a de Polignac number, because 28172823857 - 2² = 28172823853 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 28172823799 and 28172823808.

It is not an unprimeable number, because it can be changed into a prime (28172823853) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 38144 + ... + 240417.

It is an arithmetic number, because the mean of its divisors is an integer number (3707660220).

Almost surely, 2^28172823857 is an apocalyptic number.

It is an amenable number.

28172823857 is a deficient number, since it is larger than the sum of its proper divisors (1488457903).

28172823857 is a wasteful number, since it uses less digits than its factorization.

28172823857 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 283903.

The product of its digits is 3010560, while the sum is 53.

The spelling of 28172823857 in words is "twenty-eight billion, one hundred seventy-two million, eight hundred twenty-three thousand, eight hundred fifty-seven".