647265907 has 4 divisors (see below), whose sum is σ = 647317840. Its totient is φ = 647213976.

The previous prime is 647265889. The next prime is 647265923. The reversal of 647265907 is 709562746.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a 3-Lehmer number, since φ(647265907) divides (647265907-1)³.

It is a cyclic number.

It is not a de Polignac number, because 647265907 - 2¹⁹ = 646741619 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (647265947) by changing a digit.

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, 5194 + ... + 36352.

It is an arithmetic number, because the mean of its divisors is an integer number (161829460).

Almost surely, 2^647265907 is an apocalyptic number.

647265907 is the 20773-rd pentagonal number.

647265907 is a deficient number, since it is larger than the sum of its proper divisors (51933).

647265907 is a wasteful number, since it uses less digits than its factorization.

647265907 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51932.

The product of its (nonzero) digits is 635040, while the sum is 46.

The square root of 647265907 is about 25441.4210884534. The cubic root of 647265907 is about 865.0228454657.

The spelling of 647265907 in words is "six hundred forty-seven million, two hundred sixty-five thousand, nine hundred seven".