647646505 has 16 divisors (see below), whose sum is σ = 855339264. Its totient is φ = 466842880.

The previous prime is 647646491. The next prime is 647646553. The reversal of 647646505 is 505646746.

It is a happy number.

It is not a de Polignac number, because 647646505 - 2²¹ = 645549353 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 45889 + ... + 58318.

It is an arithmetic number, because the mean of its divisors is an integer number (53458704).

Almost surely, 2^647646505 is an apocalyptic number.

It is an amenable number.

647646505 is a deficient number, since it is larger than the sum of its proper divisors (207692759).

647646505 is a wasteful number, since it uses less digits than its factorization.

647646505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 104336.

The product of its (nonzero) digits is 604800, while the sum is 43.

The square root of 647646505 is about 25448.8998779908. The cubic root of 647646505 is about 865.1923592380.

The spelling of 647646505 in words is "six hundred forty-seven million, six hundred forty-six thousand, five hundred five".