257267978 has 16 divisors (see below), whose sum is σ = 421230240. Its totient is φ = 116871600.

The previous prime is 257267971. The next prime is 257267981. The reversal of 257267978 is 879762752.

257267978 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (257267971) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 72428 + ... + 75896.

It is an arithmetic number, because the mean of its divisors is an integer number (26326890).

Almost surely, 2^257267978 is an apocalyptic number.

257267978 is a deficient number, since it is larger than the sum of its proper divisors (163962262).

257267978 is a wasteful number, since it uses less digits than its factorization.

257267978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6853.

The product of its digits is 2963520, while the sum is 53.

The square root of 257267978 is about 16039.5753684441. The cubic root of 257267978 is about 636.0070226536.

The spelling of 257267978 in words is "two hundred fifty-seven million, two hundred sixty-seven thousand, nine hundred seventy-eight".