257716765 has 16 divisors (see below), whose sum is σ = 325180080. Its totient is φ = 195793920.

The previous prime is 257716721. The next prime is 257716769. The reversal of 257716765 is 567617752.

It can be written as a sum of positive squares in 8 ways, for example, as 3059001 + 254657764 = 1749^2 + 15958^2 .

It is not a de Polignac number, because 257716765 - 2¹⁹ = 257192477 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (257716769) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5724 + ... + 23413.

It is an arithmetic number, because the mean of its divisors is an integer number (20323755).

Almost surely, 2^257716765 is an apocalyptic number.

It is an amenable number.

257716765 is a deficient number, since it is larger than the sum of its proper divisors (67463315).

257716765 is a wasteful number, since it uses less digits than its factorization.

257716765 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29232.

The product of its digits is 617400, while the sum is 46.

The square root of 257716765 is about 16053.5592626682. The cubic root of 257716765 is about 636.3766319022.

The spelling of 257716765 in words is "two hundred fifty-seven million, seven hundred sixteen thousand, seven hundred sixty-five".