257630545 has 8 divisors (see below), whose sum is σ = 312344424. Its totient is φ = 203979264.

The previous prime is 257630537. The next prime is 257630561. The reversal of 257630545 is 545036752.

257630545 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 46335249 + 211295296 = 6807^2 + 14536^2 .

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 257630545 - 2³ = 257630537 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 265114 + ... + 266083.

It is an arithmetic number, because the mean of its divisors is an integer number (39043053).

Almost surely, 2^257630545 is an apocalyptic number.

It is an amenable number.

257630545 is a deficient number, since it is larger than the sum of its proper divisors (54713879).

257630545 is an equidigital number, since it uses as much as digits as its factorization.

257630545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 531299.

The product of its (nonzero) digits is 126000, while the sum is 37.

The square root of 257630545 is about 16050.8736522346. The cubic root of 257630545 is about 636.3056566811.

The spelling of 257630545 in words is "two hundred fifty-seven million, six hundred thirty thousand, five hundred forty-five".