28790215 has 8 divisors (see below), whose sum is σ = 34592688. Its totient is φ = 23002560.

The previous prime is 28790213. The next prime is 28790219. The reversal of 28790215 is 51209782.

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

It is not a de Polignac number, because 28790215 - 2¹ = 28790213 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28790213) 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, 1155 + ... + 7675.

It is an arithmetic number, because the mean of its divisors is an integer number (4324086).

Almost surely, 2^28790215 is an apocalyptic number.

28790215 is a deficient number, since it is larger than the sum of its proper divisors (5802473).

28790215 is an equidigital number, since it uses as much as digits as its factorization.

28790215 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7409.

The product of its (nonzero) digits is 10080, while the sum is 34.

The square root of 28790215 is about 5365.6514050020. The cubic root of 28790215 is about 306.4890544983.

Adding to 28790215 its reverse (51209782), we get a palindrome (79999997).

The spelling of 28790215 in words is "twenty-eight million, seven hundred ninety thousand, two hundred fifteen".