28125806775 has 24 divisors (see below), whose sum is σ = 50728729344. Its totient is φ = 13636754400.

The previous prime is 28125806773. The next prime is 28125806777. The reversal of 28125806775 is 57760852182.

It is an interprime number because it is at equal distance from previous prime (28125806773) and next prime (28125806777).

It is not a de Polignac number, because 28125806775 - 2¹ = 28125806773 is a prime.

It is a super-2 number, since 2×28125806775² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28125806773) 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, 17045119 + ... + 17046768.

It is an arithmetic number, because the mean of its divisors is an integer number (2113697056).

Almost surely, 2^28125806775 is an apocalyptic number.

28125806775 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

28125806775 is a deficient number, since it is larger than the sum of its proper divisors (22602922569).

28125806775 is a wasteful number, since it uses less digits than its factorization.

28125806775 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34091911 (or 34091906 counting only the distinct ones).

The product of its (nonzero) digits is 1881600, while the sum is 51.

The spelling of 28125806775 in words is "twenty-eight billion, one hundred twenty-five million, eight hundred six thousand, seven hundred seventy-five".