28229215 has 8 divisors (see below), whose sum is σ = 38714400. Its totient is φ = 19357152.

The previous prime is 28229203. The next prime is 28229219. The reversal of 28229215 is 51292282.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 28229215 - 2⁵ = 28229183 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28229219) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 403240 + ... + 403309.

It is an arithmetic number, because the mean of its divisors is an integer number (4839300).

Almost surely, 2^28229215 is an apocalyptic number.

28229215 is a deficient number, since it is larger than the sum of its proper divisors (10485185).

28229215 is an equidigital number, since it uses as much as digits as its factorization.

28229215 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 806561.

The product of its digits is 5760, while the sum is 31.

The square root of 28229215 is about 5313.1172582581. The cubic root of 28229215 is about 304.4852555632.

The spelling of 28229215 in words is "twenty-eight million, two hundred twenty-nine thousand, two hundred fifteen".