28718578 has 8 divisors (see below), whose sum is σ = 49231872. Its totient is φ = 12307956.

The previous prime is 28718567. The next prime is 28718579. The reversal of 28718578 is 87581782.

It is a happy number.

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

It is not an unprimeable number, because it can be changed into a prime (28718579) 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, 1025650 + ... + 1025677.

It is an arithmetic number, because the mean of its divisors is an integer number (6153984).

Almost surely, 2^28718578 is an apocalyptic number.

28718578 is a deficient number, since it is larger than the sum of its proper divisors (20513294).

28718578 is a wasteful number, since it uses less digits than its factorization.

28718578 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2051336.

The product of its digits is 250880, while the sum is 46.

The square root of 28718578 is about 5358.9717297258. The cubic root of 28718578 is about 306.2346371302.

It can be divided in two parts, 2871 and 8578, that added together give a square (11449 = 107²).

The spelling of 28718578 in words is "twenty-eight million, seven hundred eighteen thousand, five hundred seventy-eight".