257720623 has 8 divisors (see below), whose sum is σ = 260360496. Its totient is φ = 255091200.

The previous prime is 257720621. The next prime is 257720627. The reversal of 257720623 is 326027752.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 257720623 - 2¹ = 257720621 is a prime.

It is a super-3 number, since 3×257720623³ (a number of 26 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (257720621) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 52815 + ... + 57487.

It is an arithmetic number, because the mean of its divisors is an integer number (32545062).

Almost surely, 2^257720623 is an apocalyptic number.

257720623 is a deficient number, since it is larger than the sum of its proper divisors (2639873).

257720623 is a wasteful number, since it uses less digits than its factorization.

257720623 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5225.

The product of its (nonzero) digits is 35280, while the sum is 34.

The square root of 257720623 is about 16053.6794224875. The cubic root of 257720623 is about 636.3798073893.

The spelling of 257720623 in words is "two hundred fifty-seven million, seven hundred twenty thousand, six hundred twenty-three".