279664225 has 12 divisors (see below), whose sum is σ = 347120640. Its totient is φ = 223514000.

The previous prime is 279664223. The next prime is 279664283. The reversal of 279664225 is 522466972.

It is not a de Polignac number, because 279664225 - 2¹ = 279664223 is a prime.

It is not an unprimeable number, because it can be changed into a prime (279664223) 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 11 ways as a sum of consecutive naturals, for example, 23916 + ... + 33634.

It is an arithmetic number, because the mean of its divisors is an integer number (28926720).

Almost surely, 2^279664225 is an apocalyptic number.

279664225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

279664225 is a deficient number, since it is larger than the sum of its proper divisors (67456415).

279664225 is a wasteful number, since it uses less digits than its factorization.

279664225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10880 (or 10875 counting only the distinct ones).

The product of its digits is 362880, while the sum is 43.

The square root of 279664225 is about 16723.1643237756. The cubic root of 279664225 is about 653.9516473649.

The spelling of 279664225 in words is "two hundred seventy-nine million, six hundred sixty-four thousand, two hundred twenty-five".