256660770 has 16 divisors (see below), whose sum is σ = 615985920. Its totient is φ = 68442864.

The previous prime is 256660769. The next prime is 256660783. The reversal of 256660770 is 77066652.

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4277650 + ... + 4277709.

It is an arithmetic number, because the mean of its divisors is an integer number (38499120).

Almost surely, 2^256660770 is an apocalyptic number.

256660770 is an abundant number, since it is smaller than the sum of its proper divisors (359325150).

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

256660770 is a wasteful number, since it uses less digits than its factorization.

256660770 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8555369.

The product of its (nonzero) digits is 105840, while the sum is 39.

The square root of 256660770 is about 16020.6357551753. The cubic root of 256660770 is about 635.5062571565.

It can be divided in two parts, 2566 and 60770, that added together give a palindrome (63336).

The spelling of 256660770 in words is "two hundred fifty-six million, six hundred sixty thousand, seven hundred seventy".