64971605 has 4 divisors (see below), whose sum is σ = 77965932. Its totient is φ = 51977280.

The previous prime is 64971589. The next prime is 64971607. The reversal of 64971605 is 50617946.

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 43059844 + 21911761 = 6562^2 + 4681^2 .

It is not a de Polignac number, because 64971605 - 2⁴ = 64971589 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64971607) 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 3 ways as a sum of consecutive naturals, for example, 6497156 + ... + 6497165.

It is an arithmetic number, because the mean of its divisors is an integer number (19491483).

Almost surely, 2^64971605 is an apocalyptic number.

It is an amenable number.

64971605 is a deficient number, since it is larger than the sum of its proper divisors (12994327).

64971605 is a wasteful number, since it uses less digits than its factorization.

64971605 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12994326.

The product of its (nonzero) digits is 45360, while the sum is 38.

The square root of 64971605 is about 8060.4965727925. The cubic root of 64971605 is about 402.0140193786.

The spelling of 64971605 in words is "sixty-four million, nine hundred seventy-one thousand, six hundred five".