647354065 has 4 divisors (see below), whose sum is σ = 776824884. Its totient is φ = 517883248.

The previous prime is 647354053. The next prime is 647354069. The reversal of 647354065 is 560453746.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 560453746 = 2 ⋅280226873.

It can be written as a sum of positive squares in 2 ways, for example, as 488896321 + 158457744 = 22111^2 + 12588^2 .

It is a cyclic number.

It is not a de Polignac number, because 647354065 - 2⁷ = 647353937 is a prime.

It is a Smith number, since the sum of its digits (40) 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 not an unprimeable number, because it can be changed into a prime (647354069) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 64735402 + ... + 64735411.

It is an arithmetic number, because the mean of its divisors is an integer number (194206221).

Almost surely, 2^647354065 is an apocalyptic number.

It is an amenable number.

647354065 is a deficient number, since it is larger than the sum of its proper divisors (129470819).

647354065 is a wasteful number, since it uses less digits than its factorization.

647354065 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 129470818.

The product of its (nonzero) digits is 302400, while the sum is 40.

The square root of 647354065 is about 25443.1535977756. The cubic root of 647354065 is about 865.0621158908.

The spelling of 647354065 in words is "six hundred forty-seven million, three hundred fifty-four thousand, sixty-five".