64390665 has 8 divisors (see below), whose sum is σ = 103025088. Its totient is φ = 34341680.

The previous prime is 64390661. The next prime is 64390709. The reversal of 64390665 is 56609346.

It is a happy number.

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

It is not a de Polignac number, because 64390665 - 2² = 64390661 is a prime.

It is not an unprimeable number, because it can be changed into a prime (64390661) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2146341 + ... + 2146370.

It is an arithmetic number, because the mean of its divisors is an integer number (12878136).

Almost surely, 2^64390665 is an apocalyptic number.

It is an amenable number.

64390665 is a deficient number, since it is larger than the sum of its proper divisors (38634423).

64390665 is a wasteful number, since it uses less digits than its factorization.

64390665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4292719.

The product of its (nonzero) digits is 116640, while the sum is 39.

The square root of 64390665 is about 8024.3794152570. The cubic root of 64390665 is about 400.8122349861.

The spelling of 64390665 in words is "sixty-four million, three hundred ninety thousand, six hundred sixty-five".