256706620 has 48 divisors (see below), whose sum is σ = 549930528. Its totient is φ = 100638720.

The previous prime is 256706573. The next prime is 256706669. The reversal of 256706620 is 26607652.

It is a happy number.

256706620 is digitally balanced in base 3 and base 9, because in such bases it contains all the possibile digits an equal number of times.

256706620 is strictly pandigital in base 9.

It is a congruent 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 15 ways as a sum of consecutive naturals, for example, 218635 + ... + 219805.

It is an arithmetic number, because the mean of its divisors is an integer number (11456886).

Almost surely, 2^256706620 is an apocalyptic number.

256706620 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

256706620 is an abundant number, since it is smaller than the sum of its proper divisors (293223908).

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

256706620 is a wasteful number, since it uses less digits than its factorization.

256706620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1390 (or 1388 counting only the distinct ones).

The product of its (nonzero) digits is 30240, while the sum is 34.

The square root of 256706620 is about 16022.0666582061. The cubic root of 256706620 is about 635.5440972817.

The spelling of 256706620 in words is "two hundred fifty-six million, seven hundred six thousand, six hundred twenty".