257256763 has 4 divisors (see below), whose sum is σ = 257479128. Its totient is φ = 257034400.

The previous prime is 257256761. The next prime is 257256773. The reversal of 257256763 is 367652752.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 257256763 - 2¹ = 257256761 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (257256761) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 109438 + ... + 111763.

It is an arithmetic number, because the mean of its divisors is an integer number (64369782).

Almost surely, 2^257256763 is an apocalyptic number.

257256763 is a deficient number, since it is larger than the sum of its proper divisors (222365).

257256763 is a wasteful number, since it uses less digits than its factorization.

257256763 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 222364.

The product of its digits is 529200, while the sum is 43.

The square root of 257256763 is about 16039.2257606158. The cubic root of 257256763 is about 635.9977807697.

The spelling of 257256763 in words is "two hundred fifty-seven million, two hundred fifty-six thousand, seven hundred sixty-three".