256240064 has 28 divisors (see below), whose sum is σ = 509055624. Its totient is φ = 127974144.

The previous prime is 256240063. The next prime is 256240073. The reversal of 256240064 is 460042652.

256240064 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256240063) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 74282 + ... + 77654.

It is an arithmetic number, because the mean of its divisors is an integer number (18180558).

Almost surely, 2^256240064 is an apocalyptic number.

It is an amenable number.

256240064 is a deficient number, since it is larger than the sum of its proper divisors (252815560).

256240064 is a wasteful number, since it uses less digits than its factorization.

256240064 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4572 (or 4562 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 29.

The square root of 256240064 is about 16007.5002420740. The cubic root of 256240064 is about 635.1588368235.

The spelling of 256240064 in words is "two hundred fifty-six million, two hundred forty thousand, sixty-four".