28225515 has 16 divisors (see below), whose sum is σ = 45734400. Its totient is φ = 14862432.

The previous prime is 28225511. The next prime is 28225529. The reversal of 28225515 is 51552282.

It is not a de Polignac number, because 28225515 - 2² = 28225511 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28225511) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10725 + ... + 13094.

It is an arithmetic number, because the mean of its divisors is an integer number (2858400).

Almost surely, 2^28225515 is an apocalyptic number.

28225515 is a deficient number, since it is larger than the sum of its proper divisors (17508885).

28225515 is a wasteful number, since it uses less digits than its factorization.

28225515 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23906.

The product of its digits is 8000, while the sum is 30.

The square root of 28225515 is about 5312.7690520104. The cubic root of 28225515 is about 304.4719520327.

Adding to 28225515 its reverse (51552282), we get a palindrome (79777797).

The spelling of 28225515 in words is "twenty-eight million, two hundred twenty-five thousand, five hundred fifteen".