28121573575 has 12 divisors (see below), whose sum is σ = 34872886048. Its totient is φ = 22495881600.

The previous prime is 28121573563. The next prime is 28121573611. The reversal of 28121573575 is 57537512182.

It is not a de Polignac number, because 28121573575 - 2¹⁹ = 28121049287 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 11 ways as a sum of consecutive naturals, for example, 644914 + ... + 687136.

Almost surely, 2^28121573575 is an apocalyptic number.

28121573575 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

28121573575 is a deficient number, since it is larger than the sum of its proper divisors (6751312473).

28121573575 is a wasteful number, since it uses less digits than its factorization.

28121573575 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68874 (or 68869 counting only the distinct ones).

The product of its digits is 588000, while the sum is 46.

The spelling of 28121573575 in words is "twenty-eight billion, one hundred twenty-one million, five hundred seventy-three thousand, five hundred seventy-five".