28784757 has 8 divisors (see below), whose sum is σ = 40637376. Its totient is φ = 18060992.

The previous prime is 28784737. The next prime is 28784773. The reversal of 28784757 is 75748782.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 28784757 - 2⁷ = 28784629 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28784737) 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, 282153 + ... + 282254.

It is an arithmetic number, because the mean of its divisors is an integer number (5079672).

Almost surely, 2^28784757 is an apocalyptic number.

It is an amenable number.

28784757 is a deficient number, since it is larger than the sum of its proper divisors (11852619).

28784757 is a wasteful number, since it uses less digits than its factorization.

28784757 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 564427.

The product of its digits is 878080, while the sum is 48.

The square root of 28784757 is about 5365.1427753602. The cubic root of 28784757 is about 306.4696853831.

The spelling of 28784757 in words is "twenty-eight million, seven hundred eighty-four thousand, seven hundred fifty-seven".