65691144 has 48 divisors (see below), whose sum is σ = 180842220. Its totient is φ = 21536640.

The previous prime is 65691133. The next prime is 65691149. The reversal of 65691144 is 44119656.

65691144 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 54199044 + 11492100 = 7362^2 + 3390^2 .

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 65691099 and 65691108.

It is not an unprimeable number, because it can be changed into a prime (65691149) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3087 + ... + 11870.

Almost surely, 2^65691144 is an apocalyptic number.

It is an amenable number.

65691144 is an abundant number, since it is smaller than the sum of its proper divisors (115151076).

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

65691144 is a wasteful number, since it uses less digits than its factorization.

65691144 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15030 (or 15023 counting only the distinct ones).

The product of its digits is 25920, while the sum is 36.

The square root of 65691144 is about 8105.0073411441. The cubic root of 65691144 is about 403.4926317159.

The spelling of 65691144 in words is "sixty-five million, six hundred ninety-one thousand, one hundred forty-four".