28258778 has 8 divisors (see below), whose sum is σ = 42411168. Its totient is φ = 14121724.

The previous prime is 28258759. The next prime is 28258793. The reversal of 28258778 is 87785282.

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3875 + ... + 8457.

It is an arithmetic number, because the mean of its divisors is an integer number (5301396).

Almost surely, 2^28258778 is an apocalyptic number.

28258778 is a deficient number, since it is larger than the sum of its proper divisors (14152390).

28258778 is a wasteful number, since it uses less digits than its factorization.

28258778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7668.

The product of its digits is 501760, while the sum is 47.

The square root of 28258778 is about 5315.8986070090. The cubic root of 28258778 is about 304.5915090453.

The spelling of 28258778 in words is "twenty-eight million, two hundred fifty-eight thousand, seven hundred seventy-eight".