28287974817 has 24 divisors (see below), whose sum is σ = 42433780480. Its totient is φ = 18831936240.

The previous prime is 28287974791. The next prime is 28287974863. The reversal of 28287974817 is 71847978282.

28287974817 is a `hidden beast` number, since 2 + 82 + 8 + 79 + 7 + 481 + 7 = 666.

It is not a de Polignac number, because 28287974817 - 2¹⁰ = 28287973793 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28287974867) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 90192 + ... + 254382.

Almost surely, 2^28287974817 is an apocalyptic number.

28287974817 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

It is an amenable number.

28287974817 is a deficient number, since it is larger than the sum of its proper divisors (14145805663).

28287974817 is an equidigital number, since it uses as much as digits as its factorization.

28287974817 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 164915 (or 164903 counting only the distinct ones).

The product of its digits is 25288704, while the sum is 63.

The spelling of 28287974817 in words is "twenty-eight billion, two hundred eighty-seven million, nine hundred seventy-four thousand, eight hundred seventeen".