257879778 has 16 divisors (see below), whose sum is σ = 555433536. Its totient is φ = 79347600.

The previous prime is 257879773. The next prime is 257879789. The reversal of 257879778 is 877978752.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (257879771) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1652998 + ... + 1653153.

It is an arithmetic number, because the mean of its divisors is an integer number (34714596).

Almost surely, 2^257879778 is an apocalyptic number.

257879778 is an abundant number, since it is smaller than the sum of its proper divisors (297553758).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

257879778 is a wasteful number, since it uses less digits than its factorization.

257879778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3306169.

The product of its digits is 13829760, while the sum is 60.

The square root of 257879778 is about 16058.6356207494. The cubic root of 257879778 is about 636.5107789108.

The spelling of 257879778 in words is "two hundred fifty-seven million, eight hundred seventy-nine thousand, seven hundred seventy-eight".