256473684 has 18 divisors (see below), whose sum is σ = 648308570. Its totient is φ = 85491216.

The previous prime is 256473673. The next prime is 256473691. The reversal of 256473684 is 486374652.

256473684 is a `hidden beast` number, since 2 + 564 + 7 + 3 + 6 + 84 = 666.

It can be written as a sum of positive squares in only one way, i.e., 255104784 + 1368900 = 15972^2 + 1170^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3562099 + ... + 3562170.

Almost surely, 2^256473684 is an apocalyptic number.

It is an amenable number.

256473684 is an abundant number, since it is smaller than the sum of its proper divisors (391834886).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

256473684 is a wasteful number, since it uses less digits than its factorization.

256473684 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7124279 (or 7124274 counting only the distinct ones).

The product of its digits is 967680, while the sum is 45.

The square root of 256473684 is about 16014.7957838993. The cubic root of 256473684 is about 635.3518078632.

The spelling of 256473684 in words is "two hundred fifty-six million, four hundred seventy-three thousand, six hundred eighty-four".