28778347280 has 40 divisors (see below), whose sum is σ = 66916824192. Its totient is φ = 11510105984.

The previous prime is 28778347219. The next prime is 28778347309. The reversal of 28778347280 is 8274387782.

It is a tau number, because it is divible by the number of its divisors (40).

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 1259639 + ... + 1282281.

Almost surely, 2^28778347280 is an apocalyptic number.

28778347280 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28778347280 is an abundant number, since it is smaller than the sum of its proper divisors (38138476912).

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

28778347280 is a wasteful number, since it uses less digits than its factorization.

28778347280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38543 (or 38537 counting only the distinct ones).

The product of its (nonzero) digits is 8429568, while the sum is 56.

The spelling of 28778347280 in words is "twenty-eight billion, seven hundred seventy-eight million, three hundred forty-seven thousand, two hundred eighty".