28130915 has 16 divisors (see below), whose sum is σ = 35161248. Its totient is φ = 21586176.

The previous prime is 28130911. The next prime is 28130929. The reversal of 28130915 is 51903182.

It is a cyclic number.

It is not a de Polignac number, because 28130915 - 2² = 28130911 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28130911) 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, 12464 + ... + 14546.

It is an arithmetic number, because the mean of its divisors is an integer number (2197578).

Almost surely, 2^28130915 is an apocalyptic number.

28130915 is a deficient number, since it is larger than the sum of its proper divisors (7030333).

28130915 is a wasteful number, since it uses less digits than its factorization.

28130915 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2198.

The product of its (nonzero) digits is 2160, while the sum is 29.

The square root of 28130915 is about 5303.8585011292. The cubic root of 28130915 is about 304.1314175286.

The spelling of 28130915 in words is "twenty-eight million, one hundred thirty thousand, nine hundred fifteen".