257540222 has 4 divisors (see below), whose sum is σ = 386310336. Its totient is φ = 128770110.

The previous prime is 257540209. The next prime is 257540249. The reversal of 257540222 is 222045752.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64385054 + ... + 64385057.

It is an arithmetic number, because the mean of its divisors is an integer number (96577584).

Almost surely, 2^257540222 is an apocalyptic number.

257540222 is a deficient number, since it is larger than the sum of its proper divisors (128770114).

257540222 is a wasteful number, since it uses less digits than its factorization.

257540222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 128770113.

The product of its (nonzero) digits is 11200, while the sum is 29.

The square root of 257540222 is about 16048.0597581141. The cubic root of 257540222 is about 636.2312869363.

Adding to 257540222 its reverse (222045752), we get a palindrome (479585974).

The spelling of 257540222 in words is "two hundred fifty-seven million, five hundred forty thousand, two hundred twenty-two".