257133878 has 16 divisors (see below), whose sum is σ = 415905840. Its totient is φ = 118828800.

The previous prime is 257133839. The next prime is 257133887. The reversal of 257133878 is 878331752.

It is a super-2 number, since 2×257133878² = 132235662430637768, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 80963 + ... + 84078.

It is an arithmetic number, because the mean of its divisors is an integer number (25994115).

Almost surely, 2^257133878 is an apocalyptic number.

257133878 is a deficient number, since it is larger than the sum of its proper divisors (158771962).

257133878 is a wasteful number, since it uses less digits than its factorization.

257133878 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 165103.

The product of its digits is 282240, while the sum is 44.

The square root of 257133878 is about 16035.3945383330. The cubic root of 257133878 is about 635.8964979970.

The spelling of 257133878 in words is "two hundred fifty-seven million, one hundred thirty-three thousand, eight hundred seventy-eight".