647443474 has 4 divisors (see below), whose sum is σ = 971165214. Its totient is φ = 323721736.

The previous prime is 647443439. The next prime is 647443481. The reversal of 647443474 is 474344746.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 573363025 + 74080449 = 23945^2 + 8607^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 647443474.

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 as a sum of consecutive naturals, namely, 161860867 + ... + 161860870.

Almost surely, 2^647443474 is an apocalyptic number.

647443474 is a deficient number, since it is larger than the sum of its proper divisors (323721740).

647443474 is a wasteful number, since it uses less digits than its factorization.

647443474 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 323721739.

The product of its digits is 903168, while the sum is 43.

The square root of 647443474 is about 25444.9105716644. The cubic root of 647443474 is about 865.1019399389.

The spelling of 647443474 in words is "six hundred forty-seven million, four hundred forty-three thousand, four hundred seventy-four".