257720743 has 12 divisors (see below), whose sum is σ = 300166560. Its totient is φ = 220631712.

The previous prime is 257720713. The next prime is 257720747. The reversal of 257720743 is 347027752.

It is not a de Polignac number, because 257720743 - 2⁹ = 257720231 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (257720747) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 43938 + ... + 49456.

It is an arithmetic number, because the mean of its divisors is an integer number (25013880).

Almost surely, 2^257720743 is an apocalyptic number.

257720743 is a deficient number, since it is larger than the sum of its proper divisors (42445817).

257720743 is an equidigital number, since it uses as much as digits as its factorization.

257720743 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6486 (or 6479 counting only the distinct ones).

The product of its (nonzero) digits is 82320, while the sum is 37.

The square root of 257720743 is about 16053.6831599481. The cubic root of 257720743 is about 636.3799061598.

The spelling of 257720743 in words is "two hundred fifty-seven million, seven hundred twenty thousand, seven hundred forty-three".