28005330775 has 6 divisors (see below), whose sum is σ = 34726610192. Its totient is φ = 22404264600.

The previous prime is 28005330767. The next prime is 28005330811. The reversal of 28005330775 is 57703350082.

It is not a de Polignac number, because 28005330775 - 2³ = 28005330767 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 560106591 + ... + 560106640.

Almost surely, 2^28005330775 is an apocalyptic number.

28005330775 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

28005330775 is a deficient number, since it is larger than the sum of its proper divisors (6721279417).

28005330775 is a wasteful number, since it uses less digits than its factorization.

28005330775 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1120213241 (or 1120213236 counting only the distinct ones).

The product of its (nonzero) digits is 176400, while the sum is 40.

The spelling of 28005330775 in words is "twenty-eight billion, five million, three hundred thirty thousand, seven hundred seventy-five".