256641776 has 10 divisors (see below), whose sum is σ = 497243472. Its totient is φ = 128320880.

The previous prime is 256641773. The next prime is 256641779. The reversal of 256641776 is 677146652.

It is an interprime number because it is at equal distance from previous prime (256641773) and next prime (256641779).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256641773) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8020040 + ... + 8020071.

Almost surely, 2^256641776 is an apocalyptic number.

It is an amenable number.

256641776 is a deficient number, since it is larger than the sum of its proper divisors (240601696).

256641776 is a wasteful number, since it uses less digits than its factorization.

256641776 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16040119 (or 16040113 counting only the distinct ones).

The product of its digits is 423360, while the sum is 44.

The square root of 256641776 is about 16020.0429462595. The cubic root of 256641776 is about 635.4905800384.

The spelling of 256641776 in words is "two hundred fifty-six million, six hundred forty-one thousand, seven hundred seventy-six".