64700005 has 4 divisors (see below), whose sum is σ = 77640012. Its totient is φ = 51760000.

The previous prime is 64699981. The next prime is 64700021. The reversal of 64700005 is 50000746.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 50000746 = 2 ⋅25000373.

It can be written as a sum of positive squares in 2 ways, for example, as 18378369 + 46321636 = 4287^2 + 6806^2 .

It is not a de Polignac number, because 64700005 - 2¹¹ = 64697957 is a prime.

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

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 (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6469996 + ... + 6470005.

It is an arithmetic number, because the mean of its divisors is an integer number (19410003).

Almost surely, 2^64700005 is an apocalyptic number.

It is an amenable number.

64700005 is a deficient number, since it is larger than the sum of its proper divisors (12940007).

64700005 is a wasteful number, since it uses less digits than its factorization.

64700005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12940006.

The product of its (nonzero) digits is 840, while the sum is 22.

The square root of 64700005 is about 8043.6313316810. The cubic root of 64700005 is about 401.4530589079.

The spelling of 64700005 in words is "sixty-four million, seven hundred thousand, five".