28580613 has 12 divisors (see below), whose sum is σ = 39170880. Its totient is φ = 18536112.

The previous prime is 28580611. The next prime is 28580623. The reversal of 28580613 is 31608582.

It is a happy number.

It is not a de Polignac number, because 28580613 - 2¹ = 28580611 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28580611) 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 11 ways as a sum of consecutive naturals, for example, 628 + ... + 7586.

It is an arithmetic number, because the mean of its divisors is an integer number (3264240).

Almost surely, 2^28580613 is an apocalyptic number.

It is an amenable number.

28580613 is a deficient number, since it is larger than the sum of its proper divisors (10590267).

28580613 is an equidigital number, since it uses as much as digits as its factorization.

28580613 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7036 (or 6999 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 33.

The square root of 28580613 is about 5346.0838938423. The cubic root of 28580613 is about 305.7434626355.

Subtracting from 28580613 its sum of digits (33), we obtain a triangular number (28580580 = T₇₅₆₀).

The spelling of 28580613 in words is "twenty-eight million, five hundred eighty thousand, six hundred thirteen".