28607539 has 4 divisors (see below), whose sum is σ = 28660960. Its totient is φ = 28554120.

The previous prime is 28607519. The next prime is 28607563. The reversal of 28607539 is 93570682.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28607539 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28607519) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25899 + ... + 26980.

It is an arithmetic number, because the mean of its divisors is an integer number (7165240).

Almost surely, 2^28607539 is an apocalyptic number.

28607539 is a deficient number, since it is larger than the sum of its proper divisors (53421).

28607539 is an equidigital number, since it uses as much as digits as its factorization.

28607539 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53420.

The product of its (nonzero) digits is 90720, while the sum is 40.

The square root of 28607539 is about 5348.6015929400. The cubic root of 28607539 is about 305.8394468672.

The spelling of 28607539 in words is "twenty-eight million, six hundred seven thousand, five hundred thirty-nine".