256276566 has 192 divisors, whose sum is σ = 726835200. Its totient is φ = 64774080.

The previous prime is 256276561. The next prime is 256276577. The reversal of 256276566 is 665672652.

256276566 is a `hidden beast` number, since 25 + 62 + 7 + 6 + 566 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256276561) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 2488071 + ... + 2488173.

It is an arithmetic number, because the mean of its divisors is an integer number (3785600).

Almost surely, 2^256276566 is an apocalyptic number.

256276566 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 256276566, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (363417600).

256276566 is an abundant number, since it is smaller than the sum of its proper divisors (470558634).

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

256276566 is a wasteful number, since it uses less digits than its factorization.

256276566 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 176 (or 159 counting only the distinct ones).

The product of its digits is 907200, while the sum is 45.

The square root of 256276566 is about 16008.6403545086. The cubic root of 256276566 is about 635.1889953484.

The spelling of 256276566 in words is "two hundred fifty-six million, two hundred seventy-six thousand, five hundred sixty-six".