64395639 has 48 divisors (see below), whose sum is σ = 118719744. Its totient is φ = 32659200.

The previous prime is 64395623. The next prime is 64395647. The reversal of 64395639 is 93659346.

It is a happy number.

64395639 is a `hidden beast` number, since 6 + 4 + 3 + 9 + 5 + 639 = 666.

It is not a de Polignac number, because 64395639 - 2⁴ = 64395623 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 64395594 and 64395603.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64395619) by changing a digit.

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 47 ways as a sum of consecutive naturals, for example, 28719 + ... + 30879.

It is an arithmetic number, because the mean of its divisors is an integer number (2473328).

Almost surely, 2^64395639 is an apocalyptic number.

64395639 is a deficient number, since it is larger than the sum of its proper divisors (54324105).

64395639 is a wasteful number, since it uses less digits than its factorization.

64395639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2228 (or 2225 counting only the distinct ones).

The product of its digits is 524880, while the sum is 45.

The square root of 64395639 is about 8024.6893397813. The cubic root of 64395639 is about 400.8225552643.

The spelling of 64395639 in words is "sixty-four million, three hundred ninety-five thousand, six hundred thirty-nine".