646622708 has 6 divisors (see below), whose sum is σ = 1131589746. Its totient is φ = 323311352.

The previous prime is 646622701. The next prime is 646622719. The reversal of 646622708 is 807226646.

It can be written as a sum of positive squares in only one way, i.e., 571592464 + 75030244 = 23908^2 + 8662^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (646622701) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80827835 + ... + 80827842.

It is an arithmetic number, because the mean of its divisors is an integer number (188598291).

Almost surely, 2^646622708 is an apocalyptic number.

It is an amenable number.

646622708 is a deficient number, since it is larger than the sum of its proper divisors (484967038).

646622708 is a wasteful number, since it uses less digits than its factorization.

646622708 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 161655681 (or 161655679 counting only the distinct ones).

The product of its (nonzero) digits is 193536, while the sum is 41.

The square root of 646622708 is about 25428.7771628917. Note that the first 3 decimals coincide. The cubic root of 646622708 is about 864.7362212616.

The spelling of 646622708 in words is "six hundred forty-six million, six hundred twenty-two thousand, seven hundred eight".