28785768 has 32 divisors (see below), whose sum is σ = 78507360. Its totient is φ = 8722880.

The previous prime is 28785767. The next prime is 28785769. The reversal of 28785768 is 86758782.

It is an interprime number because it is at equal distance from previous prime (28785767) and next prime (28785769).

It is a self number, because there is not a number n which added to its sum of digits gives 28785768.

It is not an unprimeable number, because it can be changed into a prime (28785767) 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, 54255 + ... + 54782.

It is an arithmetic number, because the mean of its divisors is an integer number (2453355).

Almost surely, 2^28785768 is an apocalyptic number.

It is an amenable number.

28785768 is an abundant number, since it is smaller than the sum of its proper divisors (49721592).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28785768 is a wasteful number, since it uses less digits than its factorization.

28785768 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 109057 (or 109053 counting only the distinct ones).

The product of its digits is 1505280, while the sum is 51.

The square root of 28785768 is about 5365.2369938335. The cubic root of 28785768 is about 306.4732733611.

It can be divided in two parts, 2878 and 5768, that added together give a triangular number (8646 = T₁₃₁).

The spelling of 28785768 in words is "twenty-eight million, seven hundred eighty-five thousand, seven hundred sixty-eight".