256771506 has 8 divisors (see below), whose sum is σ = 513543024. Its totient is φ = 85590500.

The previous prime is 256771483. The next prime is 256771511. The reversal of 256771506 is 605177652.

256771506 is digitally balanced in base 2 and base 3, because in such bases 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.

256771506 is an admirable number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21397620 + ... + 21397631.

It is an arithmetic number, because the mean of its divisors is an integer number (64192878).

Almost surely, 2^256771506 is an apocalyptic number.

256771506 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

256771506 is a wasteful number, since it uses less digits than its factorization.

256771506 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42795256.

The product of its (nonzero) digits is 88200, while the sum is 39.

The square root of 256771506 is about 16024.0914251011. The cubic root of 256771506 is about 635.5976401682.

The spelling of 256771506 in words is "two hundred fifty-six million, seven hundred seventy-one thousand, five hundred six".