647626505 has 4 divisors (see below), whose sum is σ = 777151812. Its totient is φ = 518101200.

The previous prime is 647626493. The next prime is 647626523. The reversal of 647626505 is 505626746.

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 73736569 + 573889936 = 8587^2 + 23956^2 .

It is not a de Polignac number, because 647626505 - 2¹⁰ = 647625481 is a prime.

It is a Duffinian number.

It is an unprimeable number.

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, 64762646 + ... + 64762655.

It is an arithmetic number, because the mean of its divisors is an integer number (194287953).

Almost surely, 2^647626505 is an apocalyptic number.

It is an amenable number.

647626505 is a deficient number, since it is larger than the sum of its proper divisors (129525307).

647626505 is a wasteful number, since it uses less digits than its factorization.

647626505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 129525306.

The product of its (nonzero) digits is 302400, while the sum is 41.

The square root of 647626505 is about 25448.5069306629. The cubic root of 647626505 is about 865.1834531320.

The spelling of 647626505 in words is "six hundred forty-seven million, six hundred twenty-six thousand, five hundred five".