280784471881 has 15 divisors (see below), whose sum is σ = 298125581421. Its totient is φ = 264413489436.

The previous prime is 280784471837. The next prime is 280784471911. The reversal of 280784471881 is 188174487082.

It is a happy number.

The square root of 280784471881 is 529891.

It is a perfect power (a square), and thus also a powerful number.

It is not a de Polignac number, because 280784471881 - 2⁹ = 280784471369 is a prime.

It is a super-2 number, since 2×280784471881² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (280784478881) by changing a digit.

It is a polite number, since it can be written in 14 ways as a sum of consecutive naturals, for example, 1681344060 + ... + 1681344226.

Almost surely, 2^280784471881 is an apocalyptic number.

280784471881 is the 529891-st square number.

280784471881 is the 264946-th centered octagonal number.

It is an amenable number.

280784471881 is a deficient number, since it is larger than the sum of its proper divisors (17341109540).

280784471881 is an frugal number, since it uses more digits than its factorization.

280784471881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 706 (or 186 counting only the distinct ones).

The product of its (nonzero) digits is 6422528, while the sum is 58.

The spelling of 280784471881 in words is "two hundred eighty billion, seven hundred eighty-four million, four hundred seventy-one thousand, eight hundred eighty-one".