256806073 has 8 divisors (see below), whose sum is σ = 263128320. Its totient is φ = 250519680.

The previous prime is 256806061. The next prime is 256806079. The reversal of 256806073 is 370608652.

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 256806073 - 2¹³ = 256797881 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (256806079) 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, 5833 + ... + 23401.

It is an arithmetic number, because the mean of its divisors is an integer number (32891040).

Almost surely, 2^256806073 is an apocalyptic number.

It is an amenable number.

256806073 is a deficient number, since it is larger than the sum of its proper divisors (6322247).

256806073 is a wasteful number, since it uses less digits than its factorization.

256806073 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17927.

The product of its (nonzero) digits is 60480, while the sum is 37.

The square root of 256806073 is about 16025.1699834978. The cubic root of 256806073 is about 635.6261606197.

The spelling of 256806073 in words is "two hundred fifty-six million, eight hundred six thousand, seventy-three".