257720543 has 8 divisors (see below), whose sum is σ = 275180928. Its totient is φ = 240781464.

The previous prime is 257720539. The next prime is 257720549. The reversal of 257720543 is 345027752.

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

It is a cyclic number.

It is not a de Polignac number, because 257720543 - 2² = 257720539 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 (257720549) 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, 129305 + ... + 131282.

It is an arithmetic number, because the mean of its divisors is an integer number (34397616).

Almost surely, 2^257720543 is an apocalyptic number.

257720543 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

257720543 is a deficient number, since it is larger than the sum of its proper divisors (17460385).

257720543 is a wasteful number, since it uses less digits than its factorization.

257720543 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 260653.

The product of its (nonzero) digits is 58800, while the sum is 35.

The square root of 257720543 is about 16053.6769308467. The cubic root of 257720543 is about 636.3797415423.

The spelling of 257720543 in words is "two hundred fifty-seven million, seven hundred twenty thousand, five hundred forty-three".