251798268 has 12 divisors (see below), whose sum is σ = 587529320. Its totient is φ = 83932752.

The previous prime is 251798251. The next prime is 251798291. The reversal of 251798268 is 862897152.

It is a tau number, because it is divible by the number of its divisors (12).

It is a congruent number.

It is an unprimeable number.

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, 10491583 + ... + 10491606.

Almost surely, 2^251798268 is an apocalyptic number.

It is an amenable number.

251798268 is an abundant number, since it is smaller than the sum of its proper divisors (335731052).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

251798268 is a wasteful number, since it uses less digits than its factorization.

251798268 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20983196 (or 20983194 counting only the distinct ones).

The product of its digits is 483840, while the sum is 48.

The square root of 251798268 is about 15868.1526334983. The cubic root of 251798268 is about 631.4673682289.

The spelling of 251798268 in words is "two hundred fifty-one million, seven hundred ninety-eight thousand, two hundred sixty-eight".