257672305 has 8 divisors (see below), whose sum is σ = 337316544. Its totient is φ = 187398000.

The previous prime is 257672299. The next prime is 257672309. The reversal of 257672305 is 503276752.

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

It is not a de Polignac number, because 257672305 - 2⁹ = 257671793 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (257672309) 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, 2342421 + ... + 2342530.

It is an arithmetic number, because the mean of its divisors is an integer number (42164568).

Almost surely, 2^257672305 is an apocalyptic number.

It is an amenable number.

257672305 is a deficient number, since it is larger than the sum of its proper divisors (79644239).

257672305 is a wasteful number, since it uses less digits than its factorization.

257672305 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4684967.

The product of its (nonzero) digits is 88200, while the sum is 37.

The square root of 257672305 is about 16052.1744632931. The cubic root of 257672305 is about 636.3400349657.

The spelling of 257672305 in words is "two hundred fifty-seven million, six hundred seventy-two thousand, three hundred five".