28725727 has 6 divisors (see below), whose sum is σ = 29524488. Its totient is φ = 27948024.

The previous prime is 28725721. The next prime is 28725737. The reversal of 28725727 is 72752782.

It is not a de Polignac number, because 28725727 - 2¹¹ = 28723679 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 28725727.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28725721) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 9123 + ... + 11860.

It is an arithmetic number, because the mean of its divisors is an integer number (4920748).

Almost surely, 2^28725727 is an apocalyptic number.

28725727 is a deficient number, since it is larger than the sum of its proper divisors (798761).

28725727 is an equidigital number, since it uses as much as digits as its factorization.

28725727 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21057 (or 21020 counting only the distinct ones).

The product of its digits is 109760, while the sum is 40.

The square root of 28725727 is about 5359.6387005096. The cubic root of 28725727 is about 306.2600456513.

The spelling of 28725727 in words is "twenty-eight million, seven hundred twenty-five thousand, seven hundred twenty-seven".