257340766 has 8 divisors (see below), whose sum is σ = 387479664. Its totient is φ = 128180880.

The previous prime is 257340763. The next prime is 257340773. The reversal of 257340766 is 667043752.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (257340763) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 244095 + ... + 245146.

It is an arithmetic number, because the mean of its divisors is an integer number (48434958).

Almost surely, 2^257340766 is an apocalyptic number.

257340766 is a deficient number, since it is larger than the sum of its proper divisors (130138898).

257340766 is a wasteful number, since it uses less digits than its factorization.

257340766 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 489506.

The product of its (nonzero) digits is 211680, while the sum is 40.

The square root of 257340766 is about 16041.8442206624. The cubic root of 257340766 is about 636.0669981369.

The spelling of 257340766 in words is "two hundred fifty-seven million, three hundred forty thousand, seven hundred sixty-six".