257680406 has 8 divisors (see below), whose sum is σ = 389471544. Its totient is φ = 127856560.

The previous prime is 257680363. The next prime is 257680427. The reversal of 257680406 is 604086752.

It is a happy number.

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

It is a self number, because there is not a number n which added to its sum of digits gives 257680406.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 491495 + ... + 492018.

It is an arithmetic number, because the mean of its divisors is an integer number (48683943).

Almost surely, 2^257680406 is an apocalyptic number.

257680406 is a deficient number, since it is larger than the sum of its proper divisors (131791138).

257680406 is a wasteful number, since it uses less digits than its factorization.

257680406 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 983646.

The product of its (nonzero) digits is 80640, while the sum is 38.

The square root of 257680406 is about 16052.4267947248. The cubic root of 257680406 is about 636.3467035606.

The spelling of 257680406 in words is "two hundred fifty-seven million, six hundred eighty thousand, four hundred six".