257050978 has 4 divisors (see below), whose sum is σ = 385576470. Its totient is φ = 128525488.

The previous prime is 257050939. The next prime is 257050979. The reversal of 257050978 is 879050752.

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., 133240849 + 123810129 = 11543^2 + 11127^2 .

It is not an unprimeable number, because it can be changed into a prime (257050979) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64262743 + ... + 64262746.

Almost surely, 2^257050978 is an apocalyptic number.

257050978 is a deficient number, since it is larger than the sum of its proper divisors (128525492).

257050978 is a wasteful number, since it uses less digits than its factorization.

257050978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 128525491.

The product of its (nonzero) digits is 176400, while the sum is 43.

The square root of 257050978 is about 16032.8094231797. The cubic root of 257050978 is about 635.8281529435.

The spelling of 257050978 in words is "two hundred fifty-seven million, fifty thousand, nine hundred seventy-eight".