257430779728 has 20 divisors (see below), whose sum is σ = 499577925760. Its totient is φ = 128507444064.

The previous prime is 257430779699. The next prime is 257430779729. The reversal of 257430779728 is 827977034752.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (257430779729) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12986400 + ... + 13006207.

It is an arithmetic number, because the mean of its divisors is an integer number (24978896288).

Almost surely, 2^257430779728 is an apocalyptic number.

It is an amenable number.

257430779728 is a deficient number, since it is larger than the sum of its proper divisors (242147146032).

257430779728 is a wasteful number, since it uses less digits than its factorization.

257430779728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25993234 (or 25993228 counting only the distinct ones).

The product of its (nonzero) digits is 41489280, while the sum is 61.

The spelling of 257430779728 in words is "two hundred fifty-seven billion, four hundred thirty million, seven hundred seventy-nine thousand, seven hundred twenty-eight".