256819738 has 16 divisors (see below), whose sum is σ = 452162304. Its totient is φ = 107090640.

The previous prime is 256819727. The next prime is 256819741. The reversal of 256819738 is 837918652.

256819738 is digitally balanced in base 2 and base 3, because in such bases it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 256819691 and 256819700.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 247378 + ... + 248413.

It is an arithmetic number, because the mean of its divisors is an integer number (28260144).

Almost surely, 2^256819738 is an apocalyptic number.

256819738 is a deficient number, since it is larger than the sum of its proper divisors (195342566).

256819738 is a wasteful number, since it uses less digits than its factorization.

256819738 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 495837.

The product of its digits is 725760, while the sum is 49.

The square root of 256819738 is about 16025.5963383582. The cubic root of 256819738 is about 635.6374345968.

The spelling of 256819738 in words is "two hundred fifty-six million, eight hundred nineteen thousand, seven hundred thirty-eight".