647565745 has 8 divisors (see below), whose sum is σ = 777352680. Its totient is φ = 517870080.

The previous prime is 647565739. The next prime is 647565797. The reversal of 647565745 is 547565746.

It can be written as a sum of positive squares in 4 ways, for example, as 113401201 + 534164544 = 10649^2 + 23112^2 .

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

It is not a de Polignac number, because 647565745 - 2⁷ = 647565617 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6090 + ... + 36499.

It is an arithmetic number, because the mean of its divisors is an integer number (97169085).

Almost surely, 2^647565745 is an apocalyptic number.

It is an amenable number.

647565745 is a deficient number, since it is larger than the sum of its proper divisors (129786935).

647565745 is a wasteful number, since it uses less digits than its factorization.

647565745 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45635.

The product of its digits is 3528000, while the sum is 49.

The square root of 647565745 is about 25447.3131194631. The cubic root of 647565745 is about 865.1563952571.

Subtracting from 647565745 its reverse (547565746), we obtain a palindrome (99999999).

The spelling of 647565745 in words is "six hundred forty-seven million, five hundred sixty-five thousand, seven hundred forty-five".