257422560 has 96 divisors (see below), whose sum is σ = 838887840. Its totient is φ = 66275328.

The previous prime is 257422549. The next prime is 257422573. The reversal of 257422560 is 65224752.

257422560 = T₂₃₁ + T₂₃₂ + ... + T₁₁₅₈.

It is a tau number, because it is divible by the number of its divisors (96).

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 4674 + ... + 23166.

It is an arithmetic number, because the mean of its divisors is an integer number (8738415).

Almost surely, 2^257422560 is an apocalyptic number.

257422560 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 257422560, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (419443920).

257422560 is an abundant number, since it is smaller than the sum of its proper divisors (581465280).

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

257422560 is a wasteful number, since it uses less digits than its factorization.

257422560 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18540 (or 18532 counting only the distinct ones).

The product of its (nonzero) digits is 33600, while the sum is 33.

The square root of 257422560 is about 16044.3934132768. The cubic root of 257422560 is about 636.1343808447.

The spelling of 257422560 in words is "two hundred fifty-seven million, four hundred twenty-two thousand, five hundred sixty".