257878634 has 8 divisors (see below), whose sum is σ = 416573220. Its totient is φ = 119020896.

The previous prime is 257878633. The next prime is 257878637. The reversal of 257878634 is 436878752.

It can be written as a sum of positive squares in 2 ways, for example, as 191407225 + 66471409 = 13835^2 + 8153^2 .

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

It is not an unprimeable number, because it can be changed into a prime (257878633) 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, 4959179 + ... + 4959230.

Almost surely, 2^257878634 is an apocalyptic number.

257878634 is a deficient number, since it is larger than the sum of its proper divisors (158694586).

257878634 is a wasteful number, since it uses less digits than its factorization.

257878634 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9918424.

The product of its digits is 2257920, while the sum is 50.

The square root of 257878634 is about 16058.6000012454. The cubic root of 257878634 is about 636.5098376849.

The spelling of 257878634 in words is "two hundred fifty-seven million, eight hundred seventy-eight thousand, six hundred thirty-four".