64812005 has 8 divisors (see below), whose sum is σ = 78576792. Its totient is φ = 51314688.

The previous prime is 64812001. The next prime is 64812019. The reversal of 64812005 is 50021846.

It can be written as a sum of positive squares in 4 ways, for example, as 4190209 + 60621796 = 2047^2 + 7786^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 64812005 - 2² = 64812001 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64812001) 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, 66332 + ... + 67301.

It is an arithmetic number, because the mean of its divisors is an integer number (9822099).

Almost surely, 2^64812005 is an apocalyptic number.

It is an amenable number.

64812005 is a deficient number, since it is larger than the sum of its proper divisors (13764787).

64812005 is a wasteful number, since it uses less digits than its factorization.

64812005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 133735.

The product of its (nonzero) digits is 1920, while the sum is 26.

The square root of 64812005 is about 8050.5903510240. The cubic root of 64812005 is about 401.6845726614.

The spelling of 64812005 in words is "sixty-four million, eight hundred twelve thousand, five".