256591998 has 48 divisors (see below), whose sum is σ = 630236880. Its totient is φ = 74794752.

The previous prime is 256591997. The next prime is 256592041. The reversal of 256591998 is 899195652.

256591998 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256591997) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 24411 + ... + 33302.

It is an arithmetic number, because the mean of its divisors is an integer number (13129935).

Almost surely, 2^256591998 is an apocalyptic number.

256591998 is an abundant number, since it is smaller than the sum of its proper divisors (373644882).

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

256591998 is a wasteful number, since it uses less digits than its factorization.

256591998 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57753 (or 57750 counting only the distinct ones).

The product of its digits is 1749600, while the sum is 54.

The square root of 256591998 is about 16018.4892546083. The cubic root of 256591998 is about 635.4494909946.

The spelling of 256591998 in words is "two hundred fifty-six million, five hundred ninety-one thousand, nine hundred ninety-eight".