65669920 has 48 divisors (see below), whose sum is σ = 160506360. Its totient is φ = 25360384.

The previous prime is 65669917. The next prime is 65669921. The reversal of 65669920 is 2996656.

It can be written as a sum of positive squares in 4 ways, for example, as 49956624 + 15713296 = 7068^2 + 3964^2 .

It is not an unprimeable number, because it can be changed into a prime (65669921) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2437 + ... + 11716.

Almost surely, 2^65669920 is an apocalyptic number.

It is an amenable number.

65669920 is an abundant number, since it is smaller than the sum of its proper divisors (94836440).

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

65669920 is a wasteful number, since it uses less digits than its factorization.

65669920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14197 (or 14189 counting only the distinct ones).

The product of its (nonzero) digits is 174960, while the sum is 43.

The square root of 65669920 is about 8103.6979213196. The cubic root of 65669920 is about 403.4491725344.

The spelling of 65669920 in words is "sixty-five million, six hundred sixty-nine thousand, nine hundred twenty".