28717258 has 8 divisors (see below), whose sum is σ = 43149600. Its totient is φ = 14334060.

The previous prime is 28717237. The next prime is 28717259. The reversal of 28717258 is 85271782.

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 28717258.

It is not an unprimeable number, because it can be changed into a prime (28717259) 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, 10788 + ... + 13183.

It is an arithmetic number, because the mean of its divisors is an integer number (5393700).

Almost surely, 2^28717258 is an apocalyptic number.

28717258 is a deficient number, since it is larger than the sum of its proper divisors (14432342).

28717258 is a wasteful number, since it uses less digits than its factorization.

28717258 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24572.

The product of its digits is 62720, while the sum is 40.

The square root of 28717258 is about 5358.8485703554. The cubic root of 28717258 is about 306.2299452090.

The spelling of 28717258 in words is "twenty-eight million, seven hundred seventeen thousand, two hundred fifty-eight".