28150215 has 32 divisors (see below), whose sum is σ = 48206016. Its totient is φ = 13977600.

The previous prime is 28150211. The next prime is 28150217. The reversal of 28150215 is 51205182.

It is not a de Polignac number, because 28150215 - 2² = 28150211 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28150211) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 25209 + ... + 26301.

It is an arithmetic number, because the mean of its divisors is an integer number (1506438).

Almost surely, 2^28150215 is an apocalyptic number.

28150215 is a deficient number, since it is larger than the sum of its proper divisors (20055801).

28150215 is a wasteful number, since it uses less digits than its factorization.

28150215 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1219.

The product of its (nonzero) digits is 800, while the sum is 24.

The square root of 28150215 is about 5305.6776193056. The cubic root of 28150215 is about 304.2009542465.

Adding to 28150215 its reverse (51205182), we get a palindrome (79355397).

The spelling of 28150215 in words is "twenty-eight million, one hundred fifty thousand, two hundred fifteen".