256144388 has 6 divisors (see below), whose sum is σ = 448252686. Its totient is φ = 128072192.

The previous prime is 256144373. The next prime is 256144459. The reversal of 256144388 is 883441652.

It can be written as a sum of positive squares in only one way, i.e., 185449924 + 70694464 = 13618^2 + 8408^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32018045 + ... + 32018052.

It is an arithmetic number, because the mean of its divisors is an integer number (74708781).

Almost surely, 2^256144388 is an apocalyptic number.

It is an amenable number.

256144388 is a deficient number, since it is larger than the sum of its proper divisors (192108298).

256144388 is a wasteful number, since it uses less digits than its factorization.

256144388 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64036101 (or 64036099 counting only the distinct ones).

The product of its digits is 184320, while the sum is 41.

The square root of 256144388 is about 16004.5114889521. The cubic root of 256144388 is about 635.0797742172.

The spelling of 256144388 in words is "two hundred fifty-six million, one hundred forty-four thousand, three hundred eighty-eight".