257828707 has 4 divisors (see below), whose sum is σ = 259050856. Its totient is φ = 256606560.

The previous prime is 257828693. The next prime is 257828719. The reversal of 257828707 is 707828752.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-257828707 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (257828777) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 610758 + ... + 611179.

It is an arithmetic number, because the mean of its divisors is an integer number (64762714).

Almost surely, 2^257828707 is an apocalyptic number.

257828707 is a deficient number, since it is larger than the sum of its proper divisors (1222149).

257828707 is a wasteful number, since it uses less digits than its factorization.

257828707 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1222148.

The product of its (nonzero) digits is 439040, while the sum is 46.

The square root of 257828707 is about 16057.0454006956. The cubic root of 257828707 is about 636.4687575363.

The spelling of 257828707 in words is "two hundred fifty-seven million, eight hundred twenty-eight thousand, seven hundred seven".