257664322 has 4 divisors (see below), whose sum is σ = 386496486. Its totient is φ = 128832160.

The previous prime is 257664317. The next prime is 257664347. The reversal of 257664322 is 223466752.

257664322 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

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

It can be written as a sum of positive squares in only one way, i.e., 206813161 + 50851161 = 14381^2 + 7131^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64416079 + ... + 64416082.

Almost surely, 2^257664322 is an apocalyptic number.

257664322 is a deficient number, since it is larger than the sum of its proper divisors (128832164).

257664322 is a wasteful number, since it uses less digits than its factorization.

257664322 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 128832163.

The product of its digits is 120960, while the sum is 37.

The square root of 257664322 is about 16051.9258034667. The cubic root of 257664322 is about 636.3334633696. Note that the first 3 decimals are identical.

The spelling of 257664322 in words is "two hundred fifty-seven million, six hundred sixty-four thousand, three hundred twenty-two".