64065381 has 16 divisors (see below), whose sum is σ = 86452800. Its totient is φ = 42197760.

The previous prime is 64065377. The next prime is 64065403. The reversal of 64065381 is 18356046.

It is not a de Polignac number, because 64065381 - 2² = 64065377 is a prime.

It is a super-2 number, since 2×64065381² = 8208746085350322, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64065481) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 147741 + ... + 148173.

It is an arithmetic number, because the mean of its divisors is an integer number (5403300).

Almost surely, 2^64065381 is an apocalyptic number.

It is an amenable number.

64065381 is a deficient number, since it is larger than the sum of its proper divisors (22387419).

64065381 is a wasteful number, since it uses less digits than its factorization.

64065381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 916.

The product of its (nonzero) digits is 17280, while the sum is 33.

The square root of 64065381 is about 8004.0852694109. The cubic root of 64065381 is about 400.1361640598.

It can be divided in two parts, 64065 and 381, that added together give a palindrome (64446).

The spelling of 64065381 in words is "sixty-four million, sixty-five thousand, three hundred eighty-one".