28580505 has 8 divisors (see below), whose sum is σ = 45728832. Its totient is φ = 15242928.

The previous prime is 28580501. The next prime is 28580507. The reversal of 28580505 is 50508582.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 28580505 - 2² = 28580501 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28580501) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 952669 + ... + 952698.

It is an arithmetic number, because the mean of its divisors is an integer number (5716104).

Almost surely, 2^28580505 is an apocalyptic number.

It is an amenable number.

28580505 is a deficient number, since it is larger than the sum of its proper divisors (17148327).

28580505 is a wasteful number, since it uses less digits than its factorization.

28580505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1905375.

The product of its (nonzero) digits is 16000, while the sum is 33.

The square root of 28580505 is about 5346.0737929812. The cubic root of 28580505 is about 305.7430775220.

The spelling of 28580505 in words is "twenty-eight million, five hundred eighty thousand, five hundred five".