64191444 has 12 divisors (see below), whose sum is σ = 149780064. Its totient is φ = 21397144.

The previous prime is 64191433. The next prime is 64191497. The reversal of 64191444 is 44419146.

It is a tau number, because it is divible by the number of its divisors (12).

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 2674632 + ... + 2674655.

It is an arithmetic number, because the mean of its divisors is an integer number (12481672).

Almost surely, 2^64191444 is an apocalyptic number.

It is an amenable number.

64191444 is an abundant number, since it is smaller than the sum of its proper divisors (85588620).

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

64191444 is a wasteful number, since it uses less digits than its factorization.

64191444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5349294 (or 5349292 counting only the distinct ones).

The product of its digits is 13824, while the sum is 33.

The square root of 64191444 is about 8011.9563154076. The cubic root of 64191444 is about 400.3984446396.

The spelling of 64191444 in words is "sixty-four million, one hundred ninety-one thousand, four hundred forty-four".