28587613 has 4 divisors (see below), whose sum is σ = 28598940. Its totient is φ = 28576288.

The previous prime is 28587583. The next prime is 28587631. The reversal of 28587613 is 31678582.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 3617604 + 24970009 = 1902^2 + 4997^2 .

It is a cyclic number.

It is not a de Polignac number, because 28587613 - 2¹⁷ = 28456541 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28582613) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 33 + ... + 7561.

It is an arithmetic number, because the mean of its divisors is an integer number (7149735).

Almost surely, 2^28587613 is an apocalyptic number.

It is an amenable number.

28587613 is a deficient number, since it is larger than the sum of its proper divisors (11327).

28587613 is an equidigital number, since it uses as much as digits as its factorization.

28587613 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11326.

The product of its digits is 80640, while the sum is 40.

The square root of 28587613 is about 5346.7385385859. The cubic root of 28587613 is about 305.7684216235.

The spelling of 28587613 in words is "twenty-eight million, five hundred eighty-seven thousand, six hundred thirteen".