257530530 has 16 divisors (see below), whose sum is σ = 618073344. Its totient is φ = 68674800.

The previous prime is 257530523. The next prime is 257530571. The reversal of 257530530 is 35035752.

It is a Harshad number since it is a multiple of its sum of digits (30), and also a Moran number because the ratio is a prime number: 8584351 = 257530530 / (2 + 5 + 7 + 5 + 3 + 0 + 5 + 3 + 0).

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4292146 + ... + 4292205.

It is an arithmetic number, because the mean of its divisors is an integer number (38629584).

Almost surely, 2^257530530 is an apocalyptic number.

257530530 is an abundant number, since it is smaller than the sum of its proper divisors (360542814).

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

257530530 is a wasteful number, since it uses less digits than its factorization.

257530530 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8584361.

The product of its (nonzero) digits is 15750, while the sum is 30.

The square root of 257530530 is about 16047.7577873047. The cubic root of 257530530 is about 636.2233057480.

The spelling of 257530530 in words is "two hundred fifty-seven million, five hundred thirty thousand, five hundred thirty".