28678780 has 48 divisors (see below), whose sum is σ = 65790144. Its totient is φ = 10437120.

The previous prime is 28678763. The next prime is 28678781. The reversal of 28678780 is 8787682.

It is a self number, because there is not a number n which added to its sum of digits gives 28678780.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28678781) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18225 + ... + 19735.

It is an arithmetic number, because the mean of its divisors is an integer number (1370628).

Almost surely, 2^28678780 is an apocalyptic number.

28678780 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28678780, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32895072).

28678780 is an abundant number, since it is smaller than the sum of its proper divisors (37111364).

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

28678780 is a wasteful number, since it uses less digits than its factorization.

28678780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1606 (or 1604 counting only the distinct ones).

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

The square root of 28678780 is about 5355.2572300497. The cubic root of 28678780 is about 306.0931124788.

The spelling of 28678780 in words is "twenty-eight million, six hundred seventy-eight thousand, seven hundred eighty".