257386320 has 240 divisors, whose sum is σ = 901817280. Its totient is φ = 65746944.

The previous prime is 257386303. The next prime is 257386321. The reversal of 257386320 is 23683752.

257386320 is a `hidden beast` number, since 2 + 573 + 8 + 63 + 20 = 666.

It is a tau number, because it is divible by the number of its divisors (240).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (257386321) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 3100999 + ... + 3101081.

It is an arithmetic number, because the mean of its divisors is an integer number (3757572).

Almost surely, 2^257386320 is an apocalyptic number.

257386320 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 257386320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (450908640).

257386320 is an abundant number, since it is smaller than the sum of its proper divisors (644430960).

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

257386320 is a wasteful number, since it uses less digits than its factorization.

257386320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 234 (or 225 counting only the distinct ones).

The product of its (nonzero) digits is 60480, while the sum is 36.

The square root of 257386320 is about 16043.2640070529. The cubic root of 257386320 is about 636.1045277349.

The spelling of 257386320 in words is "two hundred fifty-seven million, three hundred eighty-six thousand, three hundred twenty".