256110640 has 40 divisors (see below), whose sum is σ = 597394800. Its totient is φ = 102110976.

The previous prime is 256110619. The next prime is 256110643. The reversal of 256110640 is 46011652.

It is a tau number, because it is divible by the number of its divisors (40).

It is not an unprimeable number, because it can be changed into a prime (256110643) 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 7 ways as a sum of consecutive naturals, for example, 20311 + ... + 30409.

It is an arithmetic number, because the mean of its divisors is an integer number (14934870).

Almost surely, 2^256110640 is an apocalyptic number.

256110640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

256110640 is an abundant number, since it is smaller than the sum of its proper divisors (341284160).

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

256110640 is a wasteful number, since it uses less digits than its factorization.

256110640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10429 (or 10423 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 25.

The square root of 256110640 is about 16003.4571265086. The cubic root of 256110640 is about 635.0518815981.

The spelling of 256110640 in words is "two hundred fifty-six million, one hundred ten thousand, six hundred forty".