256679406 has 48 divisors (see below), whose sum is σ = 577521360. Its totient is φ = 82293120.

The previous prime is 256679389. The next prime is 256679431. The reversal of 256679406 is 604976652.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 162601 + ... + 164171.

It is an arithmetic number, because the mean of its divisors is an integer number (12031695).

Almost surely, 2^256679406 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 256679406, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (288760680).

256679406 is an abundant number, since it is smaller than the sum of its proper divisors (320841954).

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

256679406 is a wasteful number, since it uses less digits than its factorization.

256679406 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1921 (or 1918 counting only the distinct ones).

The product of its (nonzero) digits is 544320, while the sum is 45.

The square root of 256679406 is about 16021.2173694760. The cubic root of 256679406 is about 635.5216380397.

The spelling of 256679406 in words is "two hundred fifty-six million, six hundred seventy-nine thousand, four hundred six".