256603956 has 24 divisors (see below), whose sum is σ = 684277440. Its totient is φ = 73315392.

The previous prime is 256603951. The next prime is 256603961. The reversal of 256603956 is 659306652.

It is an interprime number because it is at equal distance from previous prime (256603951) and next prime (256603961).

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256603951) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1527321 + ... + 1527488.

It is an arithmetic number, because the mean of its divisors is an integer number (28511560).

Almost surely, 2^256603956 is an apocalyptic number.

It is an amenable number.

256603956 is an abundant number, since it is smaller than the sum of its proper divisors (427673484).

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

256603956 is a wasteful number, since it uses less digits than its factorization.

256603956 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3054823 (or 3054821 counting only the distinct ones).

The product of its (nonzero) digits is 291600, while the sum is 42.

The square root of 256603956 is about 16018.8625064328. The cubic root of 256603956 is about 635.4593621611.

The spelling of 256603956 in words is "two hundred fifty-six million, six hundred three thousand, nine hundred fifty-six".