28378052556 has 96 divisors (see below), whose sum is σ = 79173255168. Its totient is φ = 7735041600.

The previous prime is 28378052513. The next prime is 28378052557. The reversal of 28378052556 is 65525087382.

It is a hoax number, since the sum of its digits (51) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 28378052499 and 28378052508.

It is not an unprimeable number, because it can be changed into a prime (28378052557) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 720781 + ... + 759131.

It is an arithmetic number, because the mean of its divisors is an integer number (824721408).

Almost surely, 2^28378052556 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 28378052556, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (39586627584).

28378052556 is an abundant number, since it is smaller than the sum of its proper divisors (50795202612).

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

28378052556 is a wasteful number, since it uses less digits than its factorization.

28378052556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38771 (or 38769 counting only the distinct ones).

The product of its (nonzero) digits is 4032000, while the sum is 51.

The spelling of 28378052556 in words is "twenty-eight billion, three hundred seventy-eight million, fifty-two thousand, five hundred fifty-six".