28225505 has 32 divisors (see below), whose sum is σ = 42577920. Its totient is φ = 17449920.

The previous prime is 28225489. The next prime is 28225511. The reversal of 28225505 is 50552282.

It is not a de Polignac number, because 28225505 - 2⁴ = 28225489 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 64076 + ... + 64514.

It is an arithmetic number, because the mean of its divisors is an integer number (1330560).

Almost surely, 2^28225505 is an apocalyptic number.

It is an amenable number.

28225505 is a deficient number, since it is larger than the sum of its proper divisors (14352415).

28225505 is a wasteful number, since it uses less digits than its factorization.

28225505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 629.

The product of its (nonzero) digits is 8000, while the sum is 29.

The square root of 28225505 is about 5312.7681108816. The cubic root of 28225505 is about 304.4719160756.

Adding to 28225505 its reverse (50552282), we get a palindrome (78777787).

The spelling of 28225505 in words is "twenty-eight million, two hundred twenty-five thousand, five hundred five".