280256081 has 8 divisors (see below), whose sum is σ = 334218624. Its totient is φ = 229775040.

The previous prime is 280256071. The next prime is 280256083. The reversal of 280256081 is 180652082.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 280256081 - 2⁶ = 280256017 is a prime.

It is a super-2 number, since 2×280256081² = 157086941874957122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (280256083) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 870200 + ... + 870521.

It is an arithmetic number, because the mean of its divisors is an integer number (41777328).

Almost surely, 2^280256081 is an apocalyptic number.

It is an amenable number.

280256081 is a deficient number, since it is larger than the sum of its proper divisors (53962543).

280256081 is a wasteful number, since it uses less digits than its factorization.

280256081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1740751.

The product of its (nonzero) digits is 7680, while the sum is 32.

The square root of 280256081 is about 16740.8506653635. The cubic root of 280256081 is about 654.4126436316.

The spelling of 280256081 in words is "two hundred eighty million, two hundred fifty-six thousand, eighty-one".