257720016 has 40 divisors (see below), whose sum is σ = 670653504. Its totient is φ = 85277440.

The previous prime is 257720011. The next prime is 257720069. The reversal of 257720016 is 610027752.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (257720011) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 13020 + ... + 26171.

Almost surely, 2^257720016 is an apocalyptic number.

It is an amenable number.

257720016 is an abundant number, since it is smaller than the sum of its proper divisors (412933488).

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

257720016 is a wasteful number, since it uses less digits than its factorization.

257720016 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39339 (or 39333 counting only the distinct ones).

The product of its (nonzero) digits is 5880, while the sum is 30.

The square root of 257720016 is about 16053.6605171531. The cubic root of 257720016 is about 636.3793077749.

Adding to 257720016 its reverse (610027752), we get a palindrome (867747768).

The spelling of 257720016 in words is "two hundred fifty-seven million, seven hundred twenty thousand, sixteen".