280028258681 has 4 divisors (see below), whose sum is σ = 283174643700. Its totient is φ = 276881873664.

The previous prime is 280028258677. The next prime is 280028258693. The reversal of 280028258681 is 186852820082.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 191617183081 + 88411075600 = 437741^2 + 297340^2 .

It is a cyclic number.

It is not a de Polignac number, because 280028258681 - 2² = 280028258677 is a prime.

It is a super-4 number, since 4×280028258681⁴ (a number of 47 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (280028258611) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1573192376 + ... + 1573192553.

It is an arithmetic number, because the mean of its divisors is an integer number (70793660925).

Almost surely, 2^280028258681 is an apocalyptic number.

It is an amenable number.

280028258681 is a deficient number, since it is larger than the sum of its proper divisors (3146385019).

280028258681 is an equidigital number, since it uses as much as digits as its factorization.

280028258681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3146385018.

The product of its (nonzero) digits is 983040, while the sum is 50.

The spelling of 280028258681 in words is "two hundred eighty billion, twenty-eight million, two hundred fifty-eight thousand, six hundred eighty-one".