647660241 has 24 divisors (see below), whose sum is σ = 953349696. Its totient is φ = 423577440.

The previous prime is 647660227. The next prime is 647660261. The reversal of 647660241 is 142066746.

647660241 is a `hidden beast` number, since 6 + 4 + 7 + 6 + 602 + 41 = 666.

It is not a de Polignac number, because 647660241 - 2¹⁵ = 647627473 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 647660196 and 647660205.

It is not an unprimeable number, because it can be changed into a prime (647660261) by changing a digit.

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 23 ways as a sum of consecutive naturals, for example, 241876 + ... + 244538.

It is an arithmetic number, because the mean of its divisors is an integer number (39722904).

Almost surely, 2^647660241 is an apocalyptic number.

647660241 is a gapful number since it is divisible by the number (61) formed by its first and last digit.

It is an amenable number.

647660241 is a deficient number, since it is larger than the sum of its proper divisors (305689455).

647660241 is a wasteful number, since it uses less digits than its factorization.

647660241 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3173 (or 3170 counting only the distinct ones).

The product of its (nonzero) digits is 48384, while the sum is 36.

The square root of 647660241 is about 25449.1697507011. The cubic root of 647660241 is about 865.1984758454.

The spelling of 647660241 in words is "six hundred forty-seven million, six hundred sixty thousand, two hundred forty-one".