256378064 has 20 divisors (see below), whose sum is σ = 497006880. Its totient is φ = 128118240.

The previous prime is 256378063. The next prime is 256378103. The reversal of 256378064 is 460873652.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256378063) 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, 37469 + ... + 43779.

It is an arithmetic number, because the mean of its divisors is an integer number (24850344).

Almost surely, 2^256378064 is an apocalyptic number.

It is an amenable number.

256378064 is a deficient number, since it is larger than the sum of its proper divisors (240628816).

256378064 is a wasteful number, since it uses less digits than its factorization.

256378064 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8858 (or 8852 counting only the distinct ones).

The product of its (nonzero) digits is 241920, while the sum is 41.

The square root of 256378064 is about 16011.8101412676. The cubic root of 256378064 is about 635.2728395386.

The spelling of 256378064 in words is "two hundred fifty-six million, three hundred seventy-eight thousand, sixty-four".