28027505 has 8 divisors (see below), whose sum is σ = 36690624. Its totient is φ = 20383600.

The previous prime is 28027481. The next prime is 28027511. The reversal of 28027505 is 50572082.

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

It is not a de Polignac number, because 28027505 - 2¹² = 28023409 is a prime.

It is a Duffinian number.

It is a Curzon 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, 254741 + ... + 254850.

It is an arithmetic number, because the mean of its divisors is an integer number (4586328).

Almost surely, 2^28027505 is an apocalyptic number.

It is an amenable number.

28027505 is a deficient number, since it is larger than the sum of its proper divisors (8663119).

28027505 is a wasteful number, since it uses less digits than its factorization.

28027505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 509607.

The product of its (nonzero) digits is 5600, while the sum is 29.

The square root of 28027505 is about 5294.1009623920. The cubic root of 28027505 is about 303.7582948617.

Adding to 28027505 its reverse (50572082), we get a palindrome (78599587).

The spelling of 28027505 in words is "twenty-eight million, twenty-seven thousand, five hundred five".