28878173040 has 160 divisors (see below), whose sum is σ = 91304156160. Its totient is φ = 7548337152.

The previous prime is 28878172991. The next prime is 28878173047. The reversal of 28878173040 is 4037187882.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28878173047) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5193942 + ... + 5199498.

It is an arithmetic number, because the mean of its divisors is an integer number (570650976).

Almost surely, 2^28878173040 is an apocalyptic number.

28878173040 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 28878173040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (45652078080).

28878173040 is an abundant number, since it is smaller than the sum of its proper divisors (62425983120).

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

28878173040 is a wasteful number, since it uses less digits than its factorization.

28878173040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5999 (or 5993 counting only the distinct ones).

The product of its (nonzero) digits is 602112, while the sum is 48.

The spelling of 28878173040 in words is "twenty-eight billion, eight hundred seventy-eight million, one hundred seventy-three thousand, forty".