257725729 has 8 divisors (see below), whose sum is σ = 276341760. Its totient is φ = 239493696.

The previous prime is 257725711. The next prime is 257725759. The reversal of 257725729 is 927527752.

257725729 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 257725729 - 2²¹ = 255628577 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (257725759) 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, 94609 + ... + 97294.

It is an arithmetic number, because the mean of its divisors is an integer number (34542720).

Almost surely, 2^257725729 is an apocalyptic number.

It is an amenable number.

257725729 is a deficient number, since it is larger than the sum of its proper divisors (18616031).

257725729 is a wasteful number, since it uses less digits than its factorization.

257725729 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 191999.

The product of its digits is 617400, while the sum is 46.

The square root of 257725729 is about 16053.8384506634. The cubic root of 257725729 is about 636.3840100459.

The spelling of 257725729 in words is "two hundred fifty-seven million, seven hundred twenty-five thousand, seven hundred twenty-nine".