648667206 has 108 divisors (see below), whose sum is σ = 1617783804. Its totient is φ = 187685520.

The previous prime is 648667193. The next prime is 648667207. The reversal of 648667206 is 602766846.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (648667207) by changing a digit.

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 53 ways as a sum of consecutive naturals, for example, 1151881 + ... + 1152443.

Almost surely, 2^648667206 is an apocalyptic number.

648667206 is a gapful number since it is divisible by the number (66) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 648667206, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (808891902).

648667206 is an abundant number, since it is smaller than the sum of its proper divisors (969116598).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

648667206 is a wasteful number, since it uses less digits than its factorization.

648667206 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 639 (or 602 counting only the distinct ones).

The product of its (nonzero) digits is 580608, while the sum is 45.

The square root of 648667206 is about 25468.9459145839. The cubic root of 648667206 is about 865.6466395577.

The spelling of 648667206 in words is "six hundred forty-eight million, six hundred sixty-seven thousand, two hundred six".