28087713 has 6 divisors (see below), whose sum is σ = 40571154. Its totient is φ = 18725136.

The previous prime is 28087693. The next prime is 28087733. The reversal of 28087713 is 31778082.

It is an interprime number because it is at equal distance from previous prime (28087693) and next prime (28087733).

It can be written as a sum of positive squares in only one way, i.e., 25979409 + 2108304 = 5097^2 + 1452^2 .

It is not a de Polignac number, because 28087713 - 2⁹ = 28087201 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28087733) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1560420 + ... + 1560437.

It is an arithmetic number, because the mean of its divisors is an integer number (6761859).

Almost surely, 2^28087713 is an apocalyptic number.

It is an amenable number.

28087713 is a deficient number, since it is larger than the sum of its proper divisors (12483441).

28087713 is a wasteful number, since it uses less digits than its factorization.

28087713 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3120863 (or 3120860 counting only the distinct ones).

The product of its (nonzero) digits is 18816, while the sum is 36.

The square root of 28087713 is about 5299.7842408913. The cubic root of 28087713 is about 303.9756480089.

The spelling of 28087713 in words is "twenty-eight million, eighty-seven thousand, seven hundred thirteen".