647658922 has 4 divisors (see below), whose sum is σ = 971488386. Its totient is φ = 323829460.

The previous prime is 647658901. The next prime is 647658929. The reversal of 647658922 is 229856746.

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., 531256401 + 116402521 = 23049^2 + 10789^2 .

It is not an unprimeable number, because it can be changed into a prime (647658929) by changing a digit.

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 as a sum of consecutive naturals, namely, 161914729 + ... + 161914732.

Almost surely, 2^647658922 is an apocalyptic number.

647658922 is a deficient number, since it is larger than the sum of its proper divisors (323829464).

647658922 is a wasteful number, since it uses less digits than its factorization.

647658922 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 323829463.

The product of its digits is 1451520, while the sum is 49.

The square root of 647658922 is about 25449.1438362865. The cubic root of 647658922 is about 865.1978885016.

The spelling of 647658922 in words is "six hundred forty-seven million, six hundred fifty-eight thousand, nine hundred twenty-two".