64072705 has 4 divisors (see below), whose sum is σ = 76887252. Its totient is φ = 51258160.

The previous prime is 64072699. The next prime is 64072721. The reversal of 64072705 is 50727046.

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 47499664 + 16573041 = 6892^2 + 4071^2 .

It is not a de Polignac number, because 64072705 - 2⁷ = 64072577 is a prime.

It is a Smith number, since the sum of its digits (31) 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 an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6407266 + ... + 6407275.

It is an arithmetic number, because the mean of its divisors is an integer number (19221813).

Almost surely, 2^64072705 is an apocalyptic number.

It is an amenable number.

64072705 is a deficient number, since it is larger than the sum of its proper divisors (12814547).

64072705 is a wasteful number, since it uses less digits than its factorization.

64072705 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12814546.

The product of its (nonzero) digits is 11760, while the sum is 31.

The square root of 64072705 is about 8004.5427727010. The cubic root of 64072705 is about 400.1514114292.

The spelling of 64072705 in words is "sixty-four million, seventy-two thousand, seven hundred five".