256306660 has 24 divisors (see below), whose sum is σ = 550763136. Its totient is φ = 100138080.

The previous prime is 256306657. The next prime is 256306717. The reversal of 256306660 is 66603652.

It is a super-3 number, since 3×256306660³ (a number of 26 digits) contains 333 as substring.

It is an unprimeable number.

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, 148156 + ... + 149875.

It is an arithmetic number, because the mean of its divisors is an integer number (22948464).

Almost surely, 2^256306660 is an apocalyptic number.

256306660 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

256306660 is an abundant number, since it is smaller than the sum of its proper divisors (294456476).

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

256306660 is a wasteful number, since it uses less digits than its factorization.

256306660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 298083 (or 298081 counting only the distinct ones).

The product of its (nonzero) digits is 38880, while the sum is 34.

The square root of 256306660 is about 16009.5802568337. The cubic root of 256306660 is about 635.2138573296.

It can be divided in two parts, 256 and 306660, that added together give a square (306916 = 554²).

The spelling of 256306660 in words is "two hundred fifty-six million, three hundred six thousand, six hundred sixty".