257530212 has 144 divisors (see below), whose sum is σ = 731691520. Its totient is φ = 78257664.

The previous prime is 257530201. The next prime is 257530223. The reversal of 257530212 is 212035752.

It is an interprime number because it is at equal distance from previous prime (257530201) and next prime (257530223).

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1154733 + ... + 1154955.

Almost surely, 2^257530212 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 257530212, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (365845760).

257530212 is an abundant number, since it is smaller than the sum of its proper divisors (474161308).

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

257530212 is a wasteful number, since it uses less digits than its factorization.

257530212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 307 (or 282 counting only the distinct ones).

The product of its (nonzero) digits is 4200, while the sum is 27.

The square root of 257530212 is about 16047.7478793755. The cubic root of 257530212 is about 636.2230438773.

Adding to 257530212 its reverse (212035752), we get a palindrome (469565964).

The spelling of 257530212 in words is "two hundred fifty-seven million, five hundred thirty thousand, two hundred twelve".