28622215 has 4 divisors (see below), whose sum is σ = 34346664. Its totient is φ = 22897768.

The previous prime is 28622183. The next prime is 28622239. The reversal of 28622215 is 51222682.

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

It is a cyclic number.

It is not a de Polignac number, because 28622215 - 2⁵ = 28622183 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, 2862217 + ... + 2862226.

It is an arithmetic number, because the mean of its divisors is an integer number (8586666).

Almost surely, 2^28622215 is an apocalyptic number.

28622215 is a deficient number, since it is larger than the sum of its proper divisors (5724449).

28622215 is an equidigital number, since it uses as much as digits as its factorization.

28622215 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5724448.

The product of its digits is 3840, while the sum is 28.

The square root of 28622215 is about 5349.9733644197. The cubic root of 28622215 is about 305.8917376566.

Adding to 28622215 its reverse (51222682), we get a palindrome (79844897).

The spelling of 28622215 in words is "twenty-eight million, six hundred twenty-two thousand, two hundred fifteen".