28878760 has 32 divisors (see below), whose sum is σ = 66565800. Its totient is φ = 11269120.

The previous prime is 28878749. The next prime is 28878761. The reversal of 28878760 is 6787882.

It can be written as a sum of positive squares in 4 ways, for example, as 19131876 + 9746884 = 4374^2 + 3122^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 28878760.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28878761) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7165 + ... + 10444.

Almost surely, 2^28878760 is an apocalyptic number.

28878760 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28878760 is an abundant number, since it is smaller than the sum of its proper divisors (37687040).

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

28878760 is a wasteful number, since it uses less digits than its factorization.

28878760 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17661 (or 17657 counting only the distinct ones).

The product of its (nonzero) digits is 301056, while the sum is 46.

The square root of 28878760 is about 5373.8961657256. The cubic root of 28878760 is about 306.8029377570.

The spelling of 28878760 in words is "twenty-eight million, eight hundred seventy-eight thousand, seven hundred sixty".