28058605 has 4 divisors (see below), whose sum is σ = 33670332. Its totient is φ = 22446880.

The previous prime is 28058599. The next prime is 28058609. The reversal of 28058605 is 50685082.

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

It can be written as a sum of positive squares in 2 ways, for example, as 21104836 + 6953769 = 4594^2 + 2637^2 .

It is not a de Polignac number, because 28058605 - 2⁷ = 28058477 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 (28058609) 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, 2805856 + ... + 2805865.

It is an arithmetic number, because the mean of its divisors is an integer number (8417583).

Almost surely, 2^28058605 is an apocalyptic number.

It is an amenable number.

28058605 is a deficient number, since it is larger than the sum of its proper divisors (5611727).

28058605 is an equidigital number, since it uses as much as digits as its factorization.

28058605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5611726.

The product of its (nonzero) digits is 19200, while the sum is 34.

The square root of 28058605 is about 5297.0373795170. The cubic root of 28058605 is about 303.8706058572.

It can be divided in two parts, 280 and 58605, that added together give a palindrome (58885).

The spelling of 28058605 in words is "twenty-eight million, fifty-eight thousand, six hundred five".