256138748 has 24 divisors (see below), whose sum is σ = 457682400. Its totient is φ = 125397440.

The previous prime is 256138739. The next prime is 256138769. The reversal of 256138748 is 847831652.

It is a junction number, because it is equal to n+sod(n) for n = 256138699 and 256138708.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 39290 + ... + 45342.

It is an arithmetic number, because the mean of its divisors is an integer number (19070100).

Almost surely, 2^256138748 is an apocalyptic number.

It is an amenable number.

256138748 is a deficient number, since it is larger than the sum of its proper divisors (201543652).

256138748 is a wasteful number, since it uses less digits than its factorization.

256138748 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6277 (or 6275 counting only the distinct ones).

The product of its digits is 322560, while the sum is 44.

The square root of 256138748 is about 16004.3352876650. The cubic root of 256138748 is about 635.0751129449.

The spelling of 256138748 in words is "two hundred fifty-six million, one hundred thirty-eight thousand, seven hundred forty-eight".