647539474 has 8 divisors (see below), whose sum is σ = 971582220. Its totient is φ = 323678736.

The previous prime is 647539457. The next prime is 647539483. The reversal of 647539474 is 474935746.

It can be written as a sum of positive squares in 2 ways, for example, as 634687249 + 12852225 = 25193^2 + 3585^2 .

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

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 3 ways as a sum of consecutive naturals, for example, 36229 + ... + 51064.

Almost surely, 2^647539474 is an apocalyptic number.

647539474 is a deficient number, since it is larger than the sum of its proper divisors (324042746).

647539474 is a wasteful number, since it uses less digits than its factorization.

647539474 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 91004.

The product of its digits is 2540160, while the sum is 49.

The square root of 647539474 is about 25446.7969300657. The cubic root of 647539474 is about 865.1446956312.

The spelling of 647539474 in words is "six hundred forty-seven million, five hundred thirty-nine thousand, four hundred seventy-four".