28127802609 has 8 divisors (see below), whose sum is σ = 41670818720. Its totient is φ = 18751868388.

The previous prime is 28127802509. The next prime is 28127802611. The reversal of 28127802609 is 90620872182.

28127802609 is a `hidden beast` number, since 28 + 12 + 7 + 8 + 0 + 2 + 609 = 666.

It is not a de Polignac number, because 28127802609 - 2³¹ = 25980318961 is a prime.

It is a super-2 number, since 2×28127802609² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28127802679) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 520885207 + ... + 520885260.

It is an arithmetic number, because the mean of its divisors is an integer number (5208852340).

Almost surely, 2^28127802609 is an apocalyptic number.

It is an amenable number.

28127802609 is a deficient number, since it is larger than the sum of its proper divisors (13543016111).

28127802609 is a wasteful number, since it uses less digits than its factorization.

28127802609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1041770476 (or 1041770470 counting only the distinct ones).

The product of its (nonzero) digits is 193536, while the sum is 45.

The spelling of 28127802609 in words is "twenty-eight billion, one hundred twenty-seven million, eight hundred two thousand, six hundred nine".