256833691620 has 96 divisors (see below), whose sum is σ = 785150997120. Its totient is φ = 62211855360.

The previous prime is 256833691579. The next prime is 256833691633. The reversal of 256833691620 is 26196338652.

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, 652824 + ... + 969456.

It is an arithmetic number, because the mean of its divisors is an integer number (8178656220).

Almost surely, 2^256833691620 is an apocalyptic number.

256833691620 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 256833691620, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (392575498560).

256833691620 is an abundant number, since it is smaller than the sum of its proper divisors (528317305500).

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

256833691620 is a wasteful number, since it uses less digits than its factorization.

256833691620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 317885 (or 317883 counting only the distinct ones).

The product of its (nonzero) digits is 2799360, while the sum is 51.

The spelling of 256833691620 in words is "two hundred fifty-six billion, eight hundred thirty-three million, six hundred ninety-one thousand, six hundred twenty".