256064493 has 4 divisors (see below), whose sum is σ = 341419328. Its totient is φ = 170709660.

The previous prime is 256064467. The next prime is 256064503. The reversal of 256064493 is 394460652.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 256064493 - 2⁹ = 256063981 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256064423) 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, 42677413 + ... + 42677418.

It is an arithmetic number, because the mean of its divisors is an integer number (85354832).

Almost surely, 2^256064493 is an apocalyptic number.

It is an amenable number.

256064493 is a deficient number, since it is larger than the sum of its proper divisors (85354835).

256064493 is an equidigital number, since it uses as much as digits as its factorization.

256064493 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 85354834.

The product of its (nonzero) digits is 155520, while the sum is 39.

The square root of 256064493 is about 16002.0152793328. The cubic root of 256064493 is about 635.0137372770.

The spelling of 256064493 in words is "two hundred fifty-six million, sixty-four thousand, four hundred ninety-three".