257290078 has 4 divisors (see below), whose sum is σ = 385935120. Its totient is φ = 128645038.

The previous prime is 257290043. The next prime is 257290081. The reversal of 257290078 is 870092752.

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

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a self number, because there is not a number n which added to its sum of digits gives 257290078.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64322518 + ... + 64322521.

It is an arithmetic number, because the mean of its divisors is an integer number (96483780).

Almost surely, 2^257290078 is an apocalyptic number.

257290078 is a deficient number, since it is larger than the sum of its proper divisors (128645042).

257290078 is a wasteful number, since it uses less digits than its factorization.

257290078 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 128645041.

The product of its (nonzero) digits is 70560, while the sum is 40.

The square root of 257290078 is about 16040.2642746309. The cubic root of 257290078 is about 636.0252336942.

The spelling of 257290078 in words is "two hundred fifty-seven million, two hundred ninety thousand, seventy-eight".