257861428 has 24 divisors (see below), whose sum is σ = 493083360. Its totient is φ = 117018720.

The previous prime is 257861419. The next prime is 257861437. The reversal of 257861428 is 824168752.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (257861419) and next prime (257861437).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 24550 + ... + 33442.

It is an arithmetic number, because the mean of its divisors is an integer number (20545140).

Almost surely, 2^257861428 is an apocalyptic number.

It is an amenable number.

257861428 is a deficient number, since it is larger than the sum of its proper divisors (235221932).

257861428 is a wasteful number, since it uses less digits than its factorization.

257861428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9567 (or 9565 counting only the distinct ones).

The product of its digits is 215040, while the sum is 43.

The square root of 257861428 is about 16058.0642669034. The cubic root of 257861428 is about 636.4956811135.

The spelling of 257861428 in words is "two hundred fifty-seven million, eight hundred sixty-one thousand, four hundred twenty-eight".