256648973 has 8 divisors (see below), whose sum is σ = 306066048. Its totient is φ = 210420144.

The previous prime is 256648967. The next prime is 256648981. The reversal of 256648973 is 379846652.

It is a happy number.

256648973 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 cyclic number.

It is not a de Polignac number, because 256648973 - 2⁴ = 256648957 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256648933) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 796886 + ... + 797207.

It is an arithmetic number, because the mean of its divisors is an integer number (38258256).

Almost surely, 2^256648973 is an apocalyptic number.

256648973 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

It is an amenable number.

256648973 is a deficient number, since it is larger than the sum of its proper divisors (49417075).

256648973 is a wasteful number, since it uses less digits than its factorization.

256648973 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1594123.

The product of its digits is 2177280, while the sum is 50.

The square root of 256648973 is about 16020.2675695508. The cubic root of 256648973 is about 635.4965203326.

The spelling of 256648973 in words is "two hundred fifty-six million, six hundred forty-eight thousand, nine hundred seventy-three".