280991007 has 12 divisors (see below), whose sum is σ = 442773864. Its totient is φ = 170297520.

The previous prime is 280991003. The next prime is 280991017. The reversal of 280991007 is 700199082.

It is a happy number.

It is not a de Polignac number, because 280991007 - 2² = 280991003 is a prime.

It is a super-5 number, since 5×280991007⁵ (a number of 43 digits) contains 55555 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (280991003) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1419048 + ... + 1419245.

It is an arithmetic number, because the mean of its divisors is an integer number (36897822).

Almost surely, 2^280991007 is an apocalyptic number.

280991007 is a deficient number, since it is larger than the sum of its proper divisors (161782857).

280991007 is a wasteful number, since it uses less digits than its factorization.

280991007 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2838310 (or 2838307 counting only the distinct ones).

The product of its (nonzero) digits is 9072, while the sum is 36.

The square root of 280991007 is about 16762.7863733927. The cubic root of 280991007 is about 654.9841745880.

The spelling of 280991007 in words is "two hundred eighty million, nine hundred ninety-one thousand, seven".