64191439 has 12 divisors (see below), whose sum is σ = 73601136. Its totient is φ = 55765632.

The previous prime is 64191433. The next prime is 64191497. The reversal of 64191439 is 93419146.

It is not a de Polignac number, because 64191439 - 2³ = 64191431 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 64191398 and 64191407.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64191431) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8299 + ... + 14044.

It is an arithmetic number, because the mean of its divisors is an integer number (6133428).

Almost surely, 2^64191439 is an apocalyptic number.

64191439 is a deficient number, since it is larger than the sum of its proper divisors (9409697).

64191439 is a wasteful number, since it uses less digits than its factorization.

64191439 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22386 (or 22373 counting only the distinct ones).

The product of its digits is 23328, while the sum is 37.

The square root of 64191439 is about 8011.9560033740. The cubic root of 64191439 is about 400.3984342436.

The spelling of 64191439 in words is "sixty-four million, one hundred ninety-one thousand, four hundred thirty-nine".