249639668 has 12 divisors (see below), whose sum is σ = 437307780. Its totient is φ = 124694592.

The previous prime is 249639661. The next prime is 249639697. The reversal of 249639668 is 866936942.

It can be written as a sum of positive squares in 2 ways, for example, as 7463824 + 242175844 = 2732^2 + 15562^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (249639661) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 26753 + ... + 34856.

It is an arithmetic number, because the mean of its divisors is an integer number (36442315).

Almost surely, 2^249639668 is an apocalyptic number.

It is an amenable number.

249639668 is a deficient number, since it is larger than the sum of its proper divisors (187668112).

249639668 is a wasteful number, since it uses less digits than its factorization.

249639668 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62626 (or 62624 counting only the distinct ones).

The product of its digits is 3359232, while the sum is 53.

The square root of 249639668 is about 15799.9894936674. The cubic root of 249639668 is about 629.6577195057.

The spelling of 249639668 in words is "two hundred forty-nine million, six hundred thirty-nine thousand, six hundred sixty-eight".