256563612 has 120 divisors (see below), whose sum is σ = 717171840. Its totient is φ = 79742880.

The previous prime is 256563611. The next prime is 256563617. The reversal of 256563612 is 216365652.

It is a happy number.

256563612 is a `hidden beast` number, since 2 + 5 + 6 + 5 + 636 + 12 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an alternating number because its digits alternate between even and odd.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256563611) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 436783 + ... + 437369.

It is an arithmetic number, because the mean of its divisors is an integer number (5976432).

Almost surely, 2^256563612 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 256563612, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (358585920).

256563612 is an abundant number, since it is smaller than the sum of its proper divisors (460608228).

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

256563612 is a wasteful number, since it uses less digits than its factorization.

256563612 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 693 (or 682 counting only the distinct ones).

The product of its digits is 64800, while the sum is 36.

The square root of 256563612 is about 16017.6031914890. The cubic root of 256563612 is about 635.4260575093.

The spelling of 256563612 in words is "two hundred fifty-six million, five hundred sixty-three thousand, six hundred twelve".