257624742 has 8 divisors (see below), whose sum is σ = 515249496. Its totient is φ = 85874912.

The previous prime is 257624737. The next prime is 257624789. The reversal of 257624742 is 247426752.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

257624742 is an admirable number.

It is a self number, because there is not a number n which added to its sum of digits gives 257624742.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21468723 + ... + 21468734.

It is an arithmetic number, because the mean of its divisors is an integer number (64406187).

Almost surely, 2^257624742 is an apocalyptic number.

257624742 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

257624742 is a wasteful number, since it uses less digits than its factorization.

257624742 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42937462.

The product of its digits is 188160, while the sum is 39.

The square root of 257624742 is about 16050.6928822403. The cubic root of 257624742 is about 636.3008791556.

The spelling of 257624742 in words is "two hundred fifty-seven million, six hundred twenty-four thousand, seven hundred forty-two".