28925005 has 4 divisors (see below), whose sum is σ = 34710012. Its totient is φ = 23140000.

The previous prime is 28924997. The next prime is 28925027. The reversal of 28925005 is 50052982.

It is a happy number.

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 4541161 + 24383844 = 2131^2 + 4938^2 .

It is not a de Polignac number, because 28925005 - 2³ = 28924997 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

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, 2892496 + ... + 2892505.

It is an arithmetic number, because the mean of its divisors is an integer number (8677503).

Almost surely, 2^28925005 is an apocalyptic number.

It is an amenable number.

28925005 is a deficient number, since it is larger than the sum of its proper divisors (5785007).

28925005 is an equidigital number, since it uses as much as digits as its factorization.

28925005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5785006.

The product of its (nonzero) digits is 7200, while the sum is 31.

The square root of 28925005 is about 5378.1971886497. The cubic root of 28925005 is about 306.9666167055.

Adding to 28925005 its reverse (50052982), we get a palindrome (78977987).

The spelling of 28925005 in words is "twenty-eight million, nine hundred twenty-five thousand, five".