64859965 has 4 divisors (see below), whose sum is σ = 77831964. Its totient is φ = 51887968.

The previous prime is 64859941. The next prime is 64859987. The reversal of 64859965 is 56995846.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 33016516 + 31843449 = 5746^2 + 5643^2 .

It is a cyclic number.

It is not a de Polignac number, because 64859965 - 2⁵ = 64859933 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 6485992 + ... + 6486001.

It is an arithmetic number, because the mean of its divisors is an integer number (19457991).

Almost surely, 2^64859965 is an apocalyptic number.

It is an amenable number.

64859965 is a deficient number, since it is larger than the sum of its proper divisors (12971999).

64859965 is a wasteful number, since it uses less digits than its factorization.

64859965 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12971998.

The product of its digits is 2332800, while the sum is 52.

The square root of 64859965 is about 8053.5684637308. The cubic root of 64859965 is about 401.7836286010.

The spelling of 64859965 in words is "sixty-four million, eight hundred fifty-nine thousand, nine hundred sixty-five".