257720532 has 24 divisors (see below), whose sum is σ = 605388000. Its totient is φ = 85329696.

The previous prime is 257720531. The next prime is 257720539. The reversal of 257720532 is 235027752.

It is a super-2 number, since 2×257720532² = 132839745228726048, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 257720493 and 257720502.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (257720531) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 70282 + ... + 73857.

It is an arithmetic number, because the mean of its divisors is an integer number (25224500).

Almost surely, 2^257720532 is an apocalyptic number.

It is an amenable number.

257720532 is an abundant number, since it is smaller than the sum of its proper divisors (347667468).

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

257720532 is a wasteful number, since it uses less digits than its factorization.

257720532 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 144295 (or 144293 counting only the distinct ones).

The product of its (nonzero) digits is 29400, while the sum is 33.

The square root of 257720532 is about 16053.6765882461. The cubic root of 257720532 is about 636.3797324883.

The spelling of 257720532 in words is "two hundred fifty-seven million, seven hundred twenty thousand, five hundred thirty-two".