28697005 has 4 divisors (see below), whose sum is σ = 34436412. Its totient is φ = 22957600.

The previous prime is 28696999. The next prime is 28697021. The reversal of 28697005 is 50079682.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 13557124 + 15139881 = 3682^2 + 3891^2 .

It is not a de Polignac number, because 28697005 - 2¹³ = 28688813 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2869696 + ... + 2869705.

It is an arithmetic number, because the mean of its divisors is an integer number (8609103).

Almost surely, 2^28697005 is an apocalyptic number.

It is an amenable number.

28697005 is a deficient number, since it is larger than the sum of its proper divisors (5739407).

28697005 is an equidigital number, since it uses as much as digits as its factorization.

28697005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5739406.

The product of its (nonzero) digits is 30240, while the sum is 37.

The square root of 28697005 is about 5356.9585587346. The cubic root of 28697005 is about 306.1579381756.

The spelling of 28697005 in words is "twenty-eight million, six hundred ninety-seven thousand, five".