28195775 has 12 divisors (see below), whose sum is σ = 37019952. Its totient is φ = 21229440.

The previous prime is 28195763. The next prime is 28195781. The reversal of 28195775 is 57759182.

It is not a de Polignac number, because 28195775 - 2⁴ = 28195759 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, 32747 + ... + 33596.

It is an arithmetic number, because the mean of its divisors is an integer number (3084996).

Almost surely, 2^28195775 is an apocalyptic number.

28195775 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

28195775 is a deficient number, since it is larger than the sum of its proper divisors (8824177).

28195775 is a wasteful number, since it uses less digits than its factorization.

28195775 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66370 (or 66365 counting only the distinct ones).

The product of its digits is 176400, while the sum is 44.

The square root of 28195775 is about 5309.9693972753. The cubic root of 28195775 is about 304.3649781593.

The spelling of 28195775 in words is "twenty-eight million, one hundred ninety-five thousand, seven hundred seventy-five".