64397985 has 8 divisors (see below), whose sum is σ = 103036800. Its totient is φ = 34345584.

The previous prime is 64397981. The next prime is 64397987. The reversal of 64397985 is 58979346.

64397985 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 64397985 - 2² = 64397981 is a prime.

It is not an unprimeable number, because it can be changed into a prime (64397981) 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 7 ways as a sum of consecutive naturals, for example, 2146585 + ... + 2146614.

It is an arithmetic number, because the mean of its divisors is an integer number (12879600).

Almost surely, 2^64397985 is an apocalyptic number.

It is an amenable number.

64397985 is a deficient number, since it is larger than the sum of its proper divisors (38638815).

64397985 is a wasteful number, since it uses less digits than its factorization.

64397985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4293207.

The product of its digits is 1632960, while the sum is 51.

The square root of 64397985 is about 8024.8355123329. The cubic root of 64397985 is about 400.8274226658.

The spelling of 64397985 in words is "sixty-four million, three hundred ninety-seven thousand, nine hundred eighty-five".