257565480 has 64 divisors (see below), whose sum is σ = 778386240. Its totient is φ = 68178432.

The previous prime is 257565467. The next prime is 257565481. The reversal of 257565480 is 84565752.

It is not an unprimeable number, because it can be changed into a prime (257565481) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8607 + ... + 24273.

It is an arithmetic number, because the mean of its divisors is an integer number (12162285).

Almost surely, 2^257565480 is an apocalyptic number.

257565480 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 257565480, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (389193120).

257565480 is an abundant number, since it is smaller than the sum of its proper divisors (520820760).

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

257565480 is a wasteful number, since it uses less digits than its factorization.

257565480 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15818 (or 15814 counting only the distinct ones).

The product of its (nonzero) digits is 336000, while the sum is 42.

The square root of 257565480 is about 16048.8466875349. The cubic root of 257565480 is about 636.2520855057.

The spelling of 257565480 in words is "two hundred fifty-seven million, five hundred sixty-five thousand, four hundred eighty".