28727665 has 8 divisors (see below), whose sum is σ = 34959168. Its totient is φ = 22658160.

The previous prime is 28727623. The next prime is 28727683. The reversal of 28727665 is 56672782.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 28727665 - 2¹³ = 28719473 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 40107 + ... + 40816.

It is an arithmetic number, because the mean of its divisors is an integer number (4369896).

Almost surely, 2^28727665 is an apocalyptic number.

It is an amenable number.

28727665 is a deficient number, since it is larger than the sum of its proper divisors (6231503).

28727665 is an equidigital number, since it uses as much as digits as its factorization.

28727665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80999.

The product of its digits is 282240, while the sum is 43.

The square root of 28727665 is about 5359.8194932292. The cubic root of 28727665 is about 306.2669328413.

It can be divided in two parts, 28727 and 665, that added together give a palindrome (29392).

The spelling of 28727665 in words is "twenty-eight million, seven hundred twenty-seven thousand, six hundred sixty-five".