257878143 has 12 divisors (see below), whose sum is σ = 380416608. Its totient is φ = 168260640.

The previous prime is 257878073. The next prime is 257878157. The reversal of 257878143 is 341878752.

257878143 is a `hidden beast` number, since 2 + 578 + 78 + 1 + 4 + 3 = 666.

It is not a de Polignac number, because 257878143 - 2¹⁷ = 257747071 is a prime.

It is a super-2 number, since 2×257878143² = 133002273274256898, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (257878183) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 304398 + ... + 305243.

It is an arithmetic number, because the mean of its divisors is an integer number (31701384).

Almost surely, 2^257878143 is an apocalyptic number.

257878143 is a deficient number, since it is larger than the sum of its proper divisors (122538465).

257878143 is a wasteful number, since it uses less digits than its factorization.

257878143 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 609694 (or 609691 counting only the distinct ones).

The product of its digits is 376320, while the sum is 45.

The square root of 257878143 is about 16058.5847134796. The cubic root of 257878143 is about 636.5094337138.

It can be divided in two parts, 25787 and 8143, that added together give a triangular number (33930 = T₂₆₀).

The spelling of 257878143 in words is "two hundred fifty-seven million, eight hundred seventy-eight thousand, one hundred forty-three".