28012115 has 16 divisors (see below), whose sum is σ = 35354880. Its totient is φ = 21275520.

The previous prime is 28012111. The next prime is 28012121. The reversal of 28012115 is 51121082.

It is a happy number.

It is not a de Polignac number, because 28012115 - 2² = 28012111 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28012111) 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, 7262 + ... + 10428.

It is an arithmetic number, because the mean of its divisors is an integer number (2209680).

Almost surely, 2^28012115 is an apocalyptic number.

28012115 is a deficient number, since it is larger than the sum of its proper divisors (7342765).

28012115 is a wasteful number, since it uses less digits than its factorization.

28012115 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3262.

The product of its (nonzero) digits is 160, while the sum is 20.

The square root of 28012115 is about 5292.6472582253. The cubic root of 28012115 is about 303.7026864386.

Adding to 28012115 its reverse (51121082), we get a palindrome (79133197).

The spelling of 28012115 in words is "twenty-eight million, twelve thousand, one hundred fifteen".