256607889 has 8 divisors (see below), whose sum is σ = 350488992. Its totient is φ = 166899360.

The previous prime is 256607873. The next prime is 256607903. The reversal of 256607889 is 988706652.

256607889 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 256607889 - 2⁴ = 256607873 is a prime.

It is a super-3 number, since 3×256607889³ (a number of 26 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (256607189) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1042999 + ... + 1043244.

It is an arithmetic number, because the mean of its divisors is an integer number (43811124).

Almost surely, 2^256607889 is an apocalyptic number.

It is an amenable number.

256607889 is a deficient number, since it is larger than the sum of its proper divisors (93881103).

256607889 is a wasteful number, since it uses less digits than its factorization.

256607889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2086287.

The product of its (nonzero) digits is 1451520, while the sum is 51.

The square root of 256607889 is about 16018.9852674881. The cubic root of 256607889 is about 635.4626087321.

The spelling of 256607889 in words is "two hundred fifty-six million, six hundred seven thousand, eight hundred eighty-nine".