257720348 has 6 divisors (see below), whose sum is σ = 451010616. Its totient is φ = 128860172.

The previous prime is 257720347. The next prime is 257720381. The reversal of 257720348 is 843027752.

It is a super-2 number, since 2×257720348² = 132839555546482208, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (257720341) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32215040 + ... + 32215047.

It is an arithmetic number, because the mean of its divisors is an integer number (75168436).

Almost surely, 2^257720348 is an apocalyptic number.

It is an amenable number.

257720348 is a deficient number, since it is larger than the sum of its proper divisors (193290268).

257720348 is a wasteful number, since it uses less digits than its factorization.

257720348 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64430091 (or 64430089 counting only the distinct ones).

The product of its (nonzero) digits is 94080, while the sum is 38.

The square root of 257720348 is about 16053.6708574706. The cubic root of 257720348 is about 636.3795810402.

The spelling of 257720348 in words is "two hundred fifty-seven million, seven hundred twenty thousand, three hundred forty-eight".