28355883857 has 4 divisors (see below), whose sum is σ = 32406724416. Its totient is φ = 24305043300.

The previous prime is 28355883851. The next prime is 28355883877. The reversal of 28355883857 is 75838855382.

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, and also an emirpimes, since its reverse is a distinct semiprime: 75838855382 = 2 ⋅37919427691.

It is a cyclic number.

It is not a de Polignac number, because 28355883857 - 2⁶ = 28355883793 is a prime.

It is a super-2 number, since 2×28355883857² (a number of 22 digits) contains 22 as substring.

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 28355883857.

It is not an unprimeable number, because it can be changed into a prime (28355883851) 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, 2025420269 + ... + 2025420282.

It is an arithmetic number, because the mean of its divisors is an integer number (8101681104).

Almost surely, 2^28355883857 is an apocalyptic number.

It is an amenable number.

28355883857 is a deficient number, since it is larger than the sum of its proper divisors (4050840559).

28355883857 is an equidigital number, since it uses as much as digits as its factorization.

28355883857 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4050840558.

The product of its digits is 64512000, while the sum is 62.

The spelling of 28355883857 in words is "twenty-eight billion, three hundred fifty-five million, eight hundred eighty-three thousand, eight hundred fifty-seven".