257719742 has 16 divisors (see below), whose sum is σ = 445033440. Its totient is φ = 109644288.

The previous prime is 257719741. The next prime is 257719747. The reversal of 257719742 is 247917752.

It is a junction number, because it is equal to n+sod(n) for n = 257719693 and 257719702.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (257719741) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 65267 + ... + 69102.

It is an arithmetic number, because the mean of its divisors is an integer number (27814590).

Almost surely, 2^257719742 is an apocalyptic number.

257719742 is a deficient number, since it is larger than the sum of its proper divisors (187313698).

257719742 is a wasteful number, since it uses less digits than its factorization.

257719742 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 134515.

The product of its digits is 246960, while the sum is 44.

The square root of 257719742 is about 16053.6519832716. The cubic root of 257719742 is about 636.3790822485.

The spelling of 257719742 in words is "two hundred fifty-seven million, seven hundred nineteen thousand, seven hundred forty-two".