28684780624 has 80 divisors (see below), whose sum is σ = 60476129280. Its totient is φ = 13130259840.

The previous prime is 28684780583. The next prime is 28684780627. The reversal of 28684780624 is 42608748682.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28684780627) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8131149 + ... + 8134675.

It is an arithmetic number, because the mean of its divisors is an integer number (755951616).

Almost surely, 2^28684780624 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28684780624, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30238064640).

28684780624 is an abundant number, since it is smaller than the sum of its proper divisors (31791348656).

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

28684780624 is a wasteful number, since it uses less digits than its factorization.

28684780624 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4448 (or 4442 counting only the distinct ones).

The product of its (nonzero) digits is 8257536, while the sum is 55.

The spelling of 28684780624 in words is "twenty-eight billion, six hundred eighty-four million, seven hundred eighty thousand, six hundred twenty-four".