257820140 has 12 divisors (see below), whose sum is σ = 541422336. Its totient is φ = 103128048.

The previous prime is 257820109. The next prime is 257820187. The reversal of 257820140 is 41028752.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6445484 + ... + 6445523.

It is an arithmetic number, because the mean of its divisors is an integer number (45118528).

Almost surely, 2^257820140 is an apocalyptic number.

257820140 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

257820140 is an abundant number, since it is smaller than the sum of its proper divisors (283602196).

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

257820140 is a wasteful number, since it uses less digits than its factorization.

257820140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12891016 (or 12891014 counting only the distinct ones).

The product of its (nonzero) digits is 4480, while the sum is 29.

The square root of 257820140 is about 16056.7786308462. The cubic root of 257820140 is about 636.4617080391.

Adding to 257820140 its reverse (41028752), we get a palindrome (298848892).

The spelling of 257820140 in words is "two hundred fifty-seven million, eight hundred twenty thousand, one hundred forty".