28100215 has 16 divisors (see below), whose sum is σ = 39616416. Its totient is φ = 18864000.

The previous prime is 28100213. The next prime is 28100243. The reversal of 28100215 is 51200182.

It is not a de Polignac number, because 28100215 - 2¹ = 28100213 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 28100192 and 28100201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28100213) 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, 18936 + ... + 20365.

It is an arithmetic number, because the mean of its divisors is an integer number (2476026).

Almost surely, 2^28100215 is an apocalyptic number.

28100215 is a deficient number, since it is larger than the sum of its proper divisors (11516201).

28100215 is a wasteful number, since it uses less digits than its factorization.

28100215 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39330.

The product of its (nonzero) digits is 160, while the sum is 19.

The square root of 28100215 is about 5300.9635916501. The cubic root of 28100215 is about 304.0207417461.

Adding to 28100215 its reverse (51200182), we get a palindrome (79300397).

The spelling of 28100215 in words is "twenty-eight million, one hundred thousand, two hundred fifteen".