28784255 has 8 divisors (see below), whose sum is σ = 35383824. Its totient is φ = 22465600.

The previous prime is 28784251. The next prime is 28784263. The reversal of 28784255 is 55248782.

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

It is not a de Polignac number, because 28784255 - 2² = 28784251 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (41).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28784251) 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, 70001 + ... + 70410.

It is an arithmetic number, because the mean of its divisors is an integer number (4422978).

Almost surely, 2^28784255 is an apocalyptic number.

28784255 is a deficient number, since it is larger than the sum of its proper divisors (6599569).

28784255 is a wasteful number, since it uses less digits than its factorization.

28784255 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 140457.

The product of its digits is 179200, while the sum is 41.

The square root of 28784255 is about 5365.0959916855. The cubic root of 28784255 is about 306.4679037841.

The spelling of 28784255 in words is "twenty-eight million, seven hundred eighty-four thousand, two hundred fifty-five".