28515113 has 16 divisors (see below), whose sum is σ = 32270400. Its totient is φ = 24972480.

The previous prime is 28515107. The next prime is 28515119. The reversal of 28515113 is 31151582.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (28515107) and next prime (28515119).

It is a cyclic number.

It is not a de Polignac number, because 28515113 - 2²⁴ = 11737897 is a prime.

It is a super-2 number, since 2×28515113² = 1626223338805538, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (28515119) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 33983 + ... + 34811.

It is an arithmetic number, because the mean of its divisors is an integer number (2016900).

Almost surely, 2^28515113 is an apocalyptic number.

It is an amenable number.

28515113 is a deficient number, since it is larger than the sum of its proper divisors (3755287).

28515113 is a wasteful number, since it uses less digits than its factorization.

28515113 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 952.

The product of its digits is 1200, while the sum is 26.

The square root of 28515113 is about 5339.9544005544. The cubic root of 28515113 is about 305.5097201011.

Adding to 28515113 its reverse (31151582), we get a palindrome (59666695).

The spelling of 28515113 in words is "twenty-eight million, five hundred fifteen thousand, one hundred thirteen".