257288440 has 32 divisors (see below), whose sum is σ = 579672000. Its totient is φ = 102777984.

The previous prime is 257288363. The next prime is 257288441. The reversal of 257288440 is 44882752.

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a junction number, because it is equal to n+sod(n) for n = 257288393 and 257288402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (257288441) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 29281 + ... + 37039.

It is an arithmetic number, because the mean of its divisors is an integer number (18114750).

Almost surely, 2^257288440 is an apocalyptic number.

257288440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

257288440 is an abundant number, since it is smaller than the sum of its proper divisors (322383560).

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

257288440 is a wasteful number, since it uses less digits than its factorization.

257288440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8599 (or 8595 counting only the distinct ones).

The product of its (nonzero) digits is 143360, while the sum is 40.

The square root of 257288440 is about 16040.2132155405. The cubic root of 257288440 is about 636.0238839705.

The spelling of 257288440 in words is "two hundred fifty-seven million, two hundred eighty-eight thousand, four hundred forty".