28278075807780 has 96 divisors (see below), whose sum is σ = 82622315913984. Its totient is φ = 7212857608704.

The previous prime is 28278075807713. The next prime is 28278075807809. The reversal of 28278075807780 is 8770857087282.

It is a Harshad number since it is a multiple of its sum of digits (69).

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 31 ways as a sum of consecutive naturals, for example, 189643734 + ... + 189792786.

It is an arithmetic number, because the mean of its divisors is an integer number (860649124104).

Almost surely, 2^{28278075807780} is an apocalyptic number.

28278075807780 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28278075807780 is an abundant number, since it is smaller than the sum of its proper divisors (54344240106204).

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

28278075807780 is a wasteful number, since it uses less digits than its factorization.

28278075807780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 286565 (or 286563 counting only the distinct ones).

The product of its (nonzero) digits is 196689920, while the sum is 69.

The spelling of 28278075807780 in words is "twenty-eight trillion, two hundred seventy-eight billion, seventy-five million, eight hundred seven thousand, seven hundred eighty".