257727649 has 4 divisors (see below), whose sum is σ = 263211264. Its totient is φ = 252244036.

The previous prime is 257727641. The next prime is 257727661. The reversal of 257727649 is 946727752.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 257727649 - 2³ = 257727641 is a prime.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (257727641) 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, 2741737 + ... + 2741830.

It is an arithmetic number, because the mean of its divisors is an integer number (65802816).

Almost surely, 2^257727649 is an apocalyptic number.

It is an amenable number.

257727649 is a deficient number, since it is larger than the sum of its proper divisors (5483615).

257727649 is an equidigital number, since it uses as much as digits as its factorization.

257727649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5483614.

The product of its digits is 1481760, while the sum is 49.

The square root of 257727649 is about 16053.8982493350. The cubic root of 257727649 is about 636.3855903490.

The spelling of 257727649 in words is "two hundred fifty-seven million, seven hundred twenty-seven thousand, six hundred forty-nine".