28771026774280 has 144 divisors (see below), whose sum is σ = 77811277249260. Its totient is φ = 9546146507520.

The previous prime is 28771026774229. The next prime is 28771026774289. The reversal of 28771026774280 is 8247762017782.

It can be written as a sum of positive squares in 2 ways, for example, as 28770414805636 + 611968644 = 5363806^2 + 24738^2 .

It is not an unprimeable number, because it can be changed into a prime (28771026774289) 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 35 ways as a sum of consecutive naturals, for example, 5753847 + ... + 9520966.

Almost surely, 2^{28771026774280} is an apocalyptic number.

28771026774280 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28771026774280 is an abundant number, since it is smaller than the sum of its proper divisors (49040250474980).

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

28771026774280 is a wasteful number, since it uses less digits than its factorization.

28771026774280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15274900 (or 15274858 counting only the distinct ones).

The product of its (nonzero) digits is 29503488, while the sum is 61.

The spelling of 28771026774280 in words is "twenty-eight trillion, seven hundred seventy-one billion, twenty-six million, seven hundred seventy-four thousand, two hundred eighty".