256534830 has 64 divisors (see below), whose sum is σ = 686940480. Its totient is φ = 68124672.

The previous prime is 256534819. The next prime is 256534843. The reversal of 256534830 is 38435652.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 67542 + ... + 71238.

It is an arithmetic number, because the mean of its divisors is an integer number (10733445).

Almost surely, 2^256534830 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 256534830, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (343470240).

256534830 is an abundant number, since it is smaller than the sum of its proper divisors (430405650).

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

256534830 is a wasteful number, since it uses less digits than its factorization.

256534830 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3970 (or 3964 counting only the distinct ones).

The product of its (nonzero) digits is 86400, while the sum is 36.

The square root of 256534830 is about 16016.7047172632. The cubic root of 256534830 is about 635.4022953494.

The spelling of 256534830 in words is "two hundred fifty-six million, five hundred thirty-four thousand, eight hundred thirty".