28378881764 has 48 divisors (see below), whose sum is σ = 53306400000. Its totient is φ = 13179130272.

The previous prime is 28378881757. The next prime is 28378881829. The reversal of 28378881764 is 46718887382.

It is a junction number, because it is equal to n+sod(n) for n = 28378881697 and 28378881706.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 1691087 + ... + 1707785.

It is an arithmetic number, because the mean of its divisors is an integer number (1110550000).

Almost surely, 2^28378881764 is an apocalyptic number.

It is an amenable number.

28378881764 is a deficient number, since it is larger than the sum of its proper divisors (24927518236).

28378881764 is a wasteful number, since it uses less digits than its factorization.

28378881764 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17160 (or 17158 counting only the distinct ones).

The product of its digits is 28901376, while the sum is 62.

The spelling of 28378881764 in words is "twenty-eight billion, three hundred seventy-eight million, eight hundred eighty-one thousand, seven hundred sixty-four".