257613445 has 8 divisors (see below), whose sum is σ = 311872536. Its totient is φ = 204266496.

The previous prime is 257613397. The next prime is 257613451. The reversal of 257613445 is 544316752.

It can be written as a sum of positive squares in 4 ways, for example, as 9928801 + 247684644 = 3151^2 + 15738^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 257613445 - 2⁹ = 257612933 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 227412 + ... + 228541.

It is an arithmetic number, because the mean of its divisors is an integer number (38984067).

Almost surely, 2^257613445 is an apocalyptic number.

It is an amenable number.

257613445 is a deficient number, since it is larger than the sum of its proper divisors (54259091).

257613445 is a wasteful number, since it uses less digits than its factorization.

257613445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 456071.

The product of its digits is 100800, while the sum is 37.

The square root of 257613445 is about 16050.3409621104. The cubic root of 257613445 is about 636.2915782942.

The spelling of 257613445 in words is "two hundred fifty-seven million, six hundred thirteen thousand, four hundred forty-five".