256165700 has 72 divisors (see below), whose sum is σ = 657249600. Its totient is φ = 84792960.

The previous prime is 256165699. The next prime is 256165703. The reversal of 256165700 is 7561652.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (256165703) by changing a digit.

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 23 ways as a sum of consecutive naturals, for example, 13991 + ... + 26609.

Almost surely, 2^256165700 is an apocalyptic number.

256165700 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 256165700, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (328624800).

256165700 is an abundant number, since it is smaller than the sum of its proper divisors (401083900).

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

256165700 is a wasteful number, since it uses less digits than its factorization.

256165700 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12669 (or 12662 counting only the distinct ones).

The product of its (nonzero) digits is 12600, while the sum is 32.

The square root of 256165700 is about 16005.1772873655. The cubic root of 256165700 is about 635.0973872582.

The spelling of 256165700 in words is "two hundred fifty-six million, one hundred sixty-five thousand, seven hundred".