28058639 has 4 divisors (see below), whose sum is σ = 32067024. Its totient is φ = 24050256.

The previous prime is 28058629. The next prime is 28058647. The reversal of 28058639 is 93685082.

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-28058639 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 28058596 and 28058605.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28058609) 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, 2004182 + ... + 2004195.

It is an arithmetic number, because the mean of its divisors is an integer number (8016756).

Almost surely, 2^28058639 is an apocalyptic number.

28058639 is a deficient number, since it is larger than the sum of its proper divisors (4008385).

28058639 is an equidigital number, since it uses as much as digits as its factorization.

28058639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4008384.

The product of its (nonzero) digits is 103680, while the sum is 41.

The square root of 28058639 is about 5297.0405888571. The cubic root of 28058639 is about 303.8707285955.

The spelling of 28058639 in words is "twenty-eight million, fifty-eight thousand, six hundred thirty-nine".