257738730 has 16 divisors (see below), whose sum is σ = 618573024. Its totient is φ = 68730320.

The previous prime is 257738693. The next prime is 257738737. The reversal of 257738730 is 37837752.

It is not an unprimeable number, because it can be changed into a prime (257738737) 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, 4295616 + ... + 4295675.

It is an arithmetic number, because the mean of its divisors is an integer number (38660814).

Almost surely, 2^257738730 is an apocalyptic number.

257738730 is an abundant number, since it is smaller than the sum of its proper divisors (360834294).

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

257738730 is a wasteful number, since it uses less digits than its factorization.

257738730 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8591301.

The product of its (nonzero) digits is 246960, while the sum is 42.

The square root of 257738730 is about 16054.2433642947. The cubic root of 257738730 is about 636.3947106842.

The spelling of 257738730 in words is "two hundred fifty-seven million, seven hundred thirty-eight thousand, seven hundred thirty".