256506424 has 8 divisors (see below), whose sum is σ = 480949560. Its totient is φ = 128253208.

The previous prime is 256506407. The next prime is 256506427. The reversal of 256506424 is 424605652.

It is a tau number, because it is divible by the number of its divisors (8).

It is a self number, because there is not a number n which added to its sum of digits gives 256506424.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256506427) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16031644 + ... + 16031659.

It is an arithmetic number, because the mean of its divisors is an integer number (60118695).

Almost surely, 2^256506424 is an apocalyptic number.

It is an amenable number.

256506424 is a deficient number, since it is larger than the sum of its proper divisors (224443136).

256506424 is a wasteful number, since it uses less digits than its factorization.

256506424 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32063309 (or 32063305 counting only the distinct ones).

The product of its (nonzero) digits is 57600, while the sum is 34.

The square root of 256506424 is about 16015.8179310331. The cubic root of 256506424 is about 635.3788418689.

The spelling of 256506424 in words is "two hundred fifty-six million, five hundred six thousand, four hundred twenty-four".