65256989 has 16 divisors (see below), whose sum is σ = 77925120. Its totient is φ = 53464320.

The previous prime is 65256977. The next prime is 65256991. The reversal of 65256989 is 98965256.

It is not a de Polignac number, because 65256989 - 2⁴ = 65256973 is a prime.

It is a super-2 number, since 2×65256989² = 8516949226692242, which contains 22 as substring.

It is an alternating number because its digits alternate between even and odd.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65256959) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19349 + ... + 22469.

It is an arithmetic number, because the mean of its divisors is an integer number (4870320).

Almost surely, 2^65256989 is an apocalyptic number.

It is an amenable number.

65256989 is a deficient number, since it is larger than the sum of its proper divisors (12668131).

65256989 is a wasteful number, since it uses less digits than its factorization.

65256989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3260.

The product of its digits is 1166400, while the sum is 50.

The square root of 65256989 is about 8078.1798073576. The cubic root of 65256989 is about 402.6017674078.

The spelling of 65256989 in words is "sixty-five million, two hundred fifty-six thousand, nine hundred eighty-nine".