280872997 has 4 divisors (see below), whose sum is σ = 297394956. Its totient is φ = 264351040.

The previous prime is 280872973. The next prime is 280873003. The reversal of 280872997 is 799278082.

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 253478241 + 27394756 = 15921^2 + 5234^2 .

It is a cyclic number.

It is not a de Polignac number, because 280872997 - 2¹¹ = 280870949 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (280872197) 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 3 ways as a sum of consecutive naturals, for example, 8260954 + ... + 8260987.

It is an arithmetic number, because the mean of its divisors is an integer number (74348739).

Almost surely, 2^280872997 is an apocalyptic number.

It is an amenable number.

280872997 is a deficient number, since it is larger than the sum of its proper divisors (16521959).

280872997 is a wasteful number, since it uses less digits than its factorization.

280872997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16521958.

The product of its (nonzero) digits is 1016064, while the sum is 52.

The square root of 280872997 is about 16759.2660042139. The cubic root of 280872997 is about 654.8924687994.

The spelling of 280872997 in words is "two hundred eighty million, eight hundred seventy-two thousand, nine hundred ninety-seven".