256712660 has 48 divisors (see below), whose sum is σ = 577777536. Its totient is φ = 95559552.

The previous prime is 256712657. The next prime is 256712663. The reversal of 256712660 is 66217652.

It is an interprime number because it is at equal distance from previous prime (256712657) and next prime (256712663).

It is a self number, because there is not a number n which added to its sum of digits gives 256712660.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256712663) 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 15 ways as a sum of consecutive naturals, for example, 9479 + ... + 24561.

It is an arithmetic number, because the mean of its divisors is an integer number (12037032).

Almost surely, 2^256712660 is an apocalyptic number.

256712660 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 256712660, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (288888768).

256712660 is an abundant number, since it is smaller than the sum of its proper divisors (321064876).

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

256712660 is a wasteful number, since it uses less digits than its factorization.

256712660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15152 (or 15150 counting only the distinct ones).

The product of its (nonzero) digits is 30240, while the sum is 35.

The square root of 256712660 is about 16022.2551471383. The cubic root of 256712660 is about 635.5490817736.

The spelling of 256712660 in words is "two hundred fifty-six million, seven hundred twelve thousand, six hundred sixty".