257015578 has 4 divisors (see below), whose sum is σ = 385523370. Its totient is φ = 128507788.

The previous prime is 257015573. The next prime is 257015611. The reversal of 257015578 is 875510752.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 156675289 + 100340289 = 12517^2 + 10017^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 257015578.

It is not an unprimeable number, because it can be changed into a prime (257015573) by changing a digit.

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 as a sum of consecutive naturals, namely, 64253893 + ... + 64253896.

Almost surely, 2^257015578 is an apocalyptic number.

257015578 is a deficient number, since it is larger than the sum of its proper divisors (128507792).

257015578 is a wasteful number, since it uses less digits than its factorization.

257015578 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 128507791.

The product of its (nonzero) digits is 98000, while the sum is 40.

The square root of 257015578 is about 16031.7053989898. The cubic root of 257015578 is about 635.7989637270.

The spelling of 257015578 in words is "two hundred fifty-seven million, fifteen thousand, five hundred seventy-eight".