257721116 has 12 divisors (see below), whose sum is σ = 460608288. Its totient is φ = 126118752.

The previous prime is 257721047. The next prime is 257721133. The reversal of 257721116 is 611127752.

257721116 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

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, 685241 + ... + 685616.

It is an arithmetic number, because the mean of its divisors is an integer number (38384024).

Almost surely, 2^257721116 is an apocalyptic number.

It is an amenable number.

257721116 is a deficient number, since it is larger than the sum of its proper divisors (202887172).

257721116 is a wasteful number, since it uses less digits than its factorization.

257721116 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1370908 (or 1370906 counting only the distinct ones).

The product of its digits is 5880, while the sum is 32.

The square root of 257721116 is about 16053.6947772156. The cubic root of 257721116 is about 636.3802131712.

Adding to 257721116 its reverse (611127752), we get a palindrome (868848868).

The spelling of 257721116 in words is "two hundred fifty-seven million, seven hundred twenty-one thousand, one hundred sixteen".