28505727 has 24 divisors (see below), whose sum is σ = 42266640. Its totient is φ = 18506880.

The previous prime is 28505723. The next prime is 28505747. The reversal of 28505727 is 72750582.

28505727 is a `hidden beast` number, since 2 + 85 + 0 + 572 + 7 = 666.

It is not a de Polignac number, because 28505727 - 2² = 28505723 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 28505691 and 28505700.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28505723) 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, 75024 + ... + 75402.

It is an arithmetic number, because the mean of its divisors is an integer number (1761110).

Almost surely, 2^28505727 is an apocalyptic number.

28505727 is a deficient number, since it is larger than the sum of its proper divisors (13760913).

28505727 is a wasteful number, since it uses less digits than its factorization.

28505727 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 583 (or 580 counting only the distinct ones).

The product of its (nonzero) digits is 39200, while the sum is 36.

The square root of 28505727 is about 5339.0754817665. The cubic root of 28505727 is about 305.4761960197.

The spelling of 28505727 in words is "twenty-eight million, five hundred five thousand, seven hundred twenty-seven".