280630021 has 8 divisors (see below), whose sum is σ = 324027200. Its totient is φ = 238059648.

The previous prime is 280629991. The next prime is 280630037. The reversal of 280630021 is 120036082.

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 280630021 - 2⁷ = 280629893 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 280629974 and 280630001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (280630081) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 205971 + ... + 207328.

It is an arithmetic number, because the mean of its divisors is an integer number (40503400).

Almost surely, 2^280630021 is an apocalyptic number.

It is an amenable number.

280630021 is a deficient number, since it is larger than the sum of its proper divisors (43397179).

280630021 is an equidigital number, since it uses as much as digits as its factorization.

280630021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 413403.

The product of its (nonzero) digits is 576, while the sum is 22.

The square root of 280630021 is about 16752.0154309862. The cubic root of 280630021 is about 654.7035707794.

The spelling of 280630021 in words is "two hundred eighty million, six hundred thirty thousand, twenty-one".