257771740 has 24 divisors (see below), whose sum is σ = 542192112. Its totient is φ = 102942720.

The previous prime is 257771719. The next prime is 257771783. The reversal of 257771740 is 47177752.

It is a junction number, because it is equal to n+sod(n) for n = 257771693 and 257771702.

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, 2767 + ... + 22873.

It is an arithmetic number, because the mean of its divisors is an integer number (22591338).

Almost surely, 2^257771740 is an apocalyptic number.

257771740 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

257771740 is an abundant number, since it is smaller than the sum of its proper divisors (284420372).

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

257771740 is a wasteful number, since it uses less digits than its factorization.

257771740 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20757 (or 20755 counting only the distinct ones).

The product of its (nonzero) digits is 96040, while the sum is 40.

The square root of 257771740 is about 16055.2714084814. The cubic root of 257771740 is about 636.4218783676.

The spelling of 257771740 in words is "two hundred fifty-seven million, seven hundred seventy-one thousand, seven hundred forty".