28105575 has 12 divisors (see below), whose sum is σ = 46468008. Its totient is φ = 14989600.

The previous prime is 28105559. The next prime is 28105589. The reversal of 28105575 is 57550182.

It is a happy number.

It is not a de Polignac number, because 28105575 - 2⁴ = 28105559 is a prime.

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, 187296 + ... + 187445.

It is an arithmetic number, because the mean of its divisors is an integer number (3872334).

Almost surely, 2^28105575 is an apocalyptic number.

28105575 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

28105575 is a deficient number, since it is larger than the sum of its proper divisors (18362433).

28105575 is a wasteful number, since it uses less digits than its factorization.

28105575 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 374754 (or 374749 counting only the distinct ones).

The product of its (nonzero) digits is 14000, while the sum is 33.

The square root of 28105575 is about 5301.4691360037. The cubic root of 28105575 is about 304.0400707510.

It can be divided in two parts, 28105 and 575, that added together give a triangular number (28680 = T₂₃₉).

The spelling of 28105575 in words is "twenty-eight million, one hundred five thousand, five hundred seventy-five".