646220602 has 4 divisors (see below), whose sum is σ = 969330906. Its totient is φ = 323110300.

The previous prime is 646220563. The next prime is 646220611. The reversal of 646220602 is 206022646.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 206022646 = 2 ⋅103011323.

It can be written as a sum of positive squares in only one way, i.e., 398441521 + 247779081 = 19961^2 + 15741^2 .

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, 161555149 + ... + 161555152.

Almost surely, 2^646220602 is an apocalyptic number.

646220602 is a deficient number, since it is larger than the sum of its proper divisors (323110304).

646220602 is a wasteful number, since it uses less digits than its factorization.

646220602 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 323110303.

The product of its (nonzero) digits is 6912, while the sum is 28.

The square root of 646220602 is about 25420.8694186489. The cubic root of 646220602 is about 864.5569370515.

The spelling of 646220602 in words is "six hundred forty-six million, two hundred twenty thousand, six hundred two".