251328464 has 20 divisors (see below), whose sum is σ = 498274656. Its totient is φ = 122741472.

The previous prime is 251328461. The next prime is 251328499. The reversal of 251328464 is 464823152.

It is a Smith number, since the sum of its digits (35) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (251328461) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 181964 + ... + 183339.

Almost surely, 2^251328464 is an apocalyptic number.

It is an amenable number.

251328464 is a deficient number, since it is larger than the sum of its proper divisors (246946192).

251328464 is a wasteful number, since it uses less digits than its factorization.

251328464 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 365354 (or 365348 counting only the distinct ones).

The product of its digits is 46080, while the sum is 35.

The square root of 251328464 is about 15853.3423605245. The cubic root of 251328464 is about 631.0743941293.

The spelling of 251328464 in words is "two hundred fifty-one million, three hundred twenty-eight thousand, four hundred sixty-four".