256463638 has 8 divisors (see below), whose sum is σ = 386629200. Its totient is φ = 127587240.

The previous prime is 256463591. The next prime is 256463659. The reversal of 256463638 is 836364652.

256463638 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 256463594 and 256463603.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 321793 + ... + 322588.

It is an arithmetic number, because the mean of its divisors is an integer number (48328650).

Almost surely, 2^256463638 is an apocalyptic number.

256463638 is a deficient number, since it is larger than the sum of its proper divisors (130165562).

256463638 is a wasteful number, since it uses less digits than its factorization.

256463638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 644582.

The product of its digits is 622080, while the sum is 43.

The square root of 256463638 is about 16014.4821333692. The cubic root of 256463638 is about 635.3435122394.

The spelling of 256463638 in words is "two hundred fifty-six million, four hundred sixty-three thousand, six hundred thirty-eight".