64438665 has 8 divisors (see below), whose sum is σ = 103101888. Its totient is φ = 34367280.

The previous prime is 64438637. The next prime is 64438711. The reversal of 64438665 is 56683446.

64438665 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 64438665 - 2¹³ = 64430473 is a prime.

It is an unprimeable number.

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, 2147941 + ... + 2147970.

It is an arithmetic number, because the mean of its divisors is an integer number (12887736).

Almost surely, 2^64438665 is an apocalyptic number.

It is an amenable number.

64438665 is a deficient number, since it is larger than the sum of its proper divisors (38663223).

64438665 is a wasteful number, since it uses less digits than its factorization.

64438665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4295919.

The product of its digits is 414720, while the sum is 42.

The square root of 64438665 is about 8027.3697435711. The cubic root of 64438665 is about 400.9118053648.

The spelling of 64438665 in words is "sixty-four million, four hundred thirty-eight thousand, six hundred sixty-five".