257564823 has 8 divisors (see below), whose sum is σ = 343982448. Its totient is φ = 171428544.

The previous prime is 257564821. The next prime is 257564831. The reversal of 257564823 is 328465752.

257564823 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 257564823 - 2¹ = 257564821 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (257564821) 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, 68190 + ... + 71867.

It is an arithmetic number, because the mean of its divisors is an integer number (42997806).

Almost surely, 2^257564823 is an apocalyptic number.

257564823 is a deficient number, since it is larger than the sum of its proper divisors (86417625).

257564823 is a wasteful number, since it uses less digits than its factorization.

257564823 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 140673.

The product of its digits is 403200, while the sum is 42.

The square root of 257564823 is about 16048.8262187613. The cubic root of 257564823 is about 636.2515445196.

The spelling of 257564823 in words is "two hundred fifty-seven million, five hundred sixty-four thousand, eight hundred twenty-three".