256989285 has 48 divisors (see below), whose sum is σ = 520950144. Its totient is φ = 114742656.

The previous prime is 256989277. The next prime is 256989301. The reversal of 256989285 is 582989652.

256989285 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 256989285 - 2³ = 256989277 is a prime.

It is a super-2 number, since 2×256989285² = 132086985209622450, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 4059 + ... + 23031.

It is an arithmetic number, because the mean of its divisors is an integer number (10853128).

Almost surely, 2^256989285 is an apocalyptic number.

It is an amenable number.

256989285 is an abundant number, since it is smaller than the sum of its proper divisors (263960859).

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

256989285 is a wasteful number, since it uses less digits than its factorization.

256989285 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19034 (or 19031 counting only the distinct ones).

The product of its digits is 3110400, while the sum is 54.

The square root of 256989285 is about 16030.8853467299. The cubic root of 256989285 is about 635.7772819904. Note that the first 3 decimals are identical.

The spelling of 256989285 in words is "two hundred fifty-six million, nine hundred eighty-nine thousand, two hundred eighty-five".