28580278 has 8 divisors (see below), whose sum is σ = 43009200. Its totient is φ = 14243880.

The previous prime is 28580231. The next prime is 28580297. The reversal of 28580278 is 87208582.

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

It is a self number, because there is not a number n which added to its sum of digits gives 28580278.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22353 + ... + 23596.

It is an arithmetic number, because the mean of its divisors is an integer number (5376150).

Almost surely, 2^28580278 is an apocalyptic number.

28580278 is a deficient number, since it is larger than the sum of its proper divisors (14428922).

28580278 is a wasteful number, since it uses less digits than its factorization.

28580278 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46262.

The product of its (nonzero) digits is 71680, while the sum is 40.

The square root of 28580278 is about 5346.0525624053. The cubic root of 28580278 is about 305.7422680674.

It can be divided in two parts, 285 and 80278, that multiplied together give a triangular number (22879230 = T₆₇₆₄).

The spelling of 28580278 in words is "twenty-eight million, five hundred eighty thousand, two hundred seventy-eight".