257478782808 has 64 divisors (see below), whose sum is σ = 694820851200. Its totient is φ = 79040384640.

The previous prime is 257478782807. The next prime is 257478782819. The reversal of 257478782808 is 808287874752.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (257478782807) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 822898 + ... + 1091841.

It is an arithmetic number, because the mean of its divisors is an integer number (10856575800).

Almost surely, 2^257478782808 is an apocalyptic number.

It is an amenable number.

257478782808 is an abundant number, since it is smaller than the sum of its proper divisors (437342068392).

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

257478782808 is a wasteful number, since it uses less digits than its factorization.

257478782808 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1915192 (or 1915188 counting only the distinct ones).

The product of its (nonzero) digits is 112394240, while the sum is 66.

The spelling of 257478782808 in words is "two hundred fifty-seven billion, four hundred seventy-eight million, seven hundred eighty-two thousand, eight hundred eight".