280708223081556 has 96 divisors (see below), whose sum is σ = 707308416460800. Its totient is φ = 86381044041600.

The previous prime is 280708223081543. The next prime is 280708223081591. The reversal of 280708223081556 is 655180322807082.

It is a super-2 number, since 2×280708223081556² (a number of 30 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 280708223081496 and 280708223081505.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 13544235 + ... + 27292173.

It is an arithmetic number, because the mean of its divisors is an integer number (7367796004800).

Almost surely, 2^{280708223081556} 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 280708223081556, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (353654208230400).

280708223081556 is an abundant number, since it is smaller than the sum of its proper divisors (426600193379244).

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

280708223081556 is a wasteful number, since it uses less digits than its factorization.

280708223081556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13750549 (or 13750547 counting only the distinct ones).

The product of its (nonzero) digits is 12902400, while the sum is 57.

The spelling of 280708223081556 in words is "two hundred eighty trillion, seven hundred eight billion, two hundred twenty-three million, eighty-one thousand, five hundred fifty-six".