648941766 has 64 divisors (see below), whose sum is σ = 1452231936. Its totient is φ = 191664000.

The previous prime is 648941747. The next prime is 648941773. The reversal of 648941766 is 667149846.

It is a super-2 number, since 2×648941766² = 842250831318397512, which contains 22 as substring.

It is a congruent number.

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 in 31 ways as a sum of consecutive naturals, for example, 445896 + ... + 447348.

It is an arithmetic number, because the mean of its divisors is an integer number (22691124).

Almost surely, 2^648941766 is an apocalyptic number.

648941766 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 648941766, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (726115968).

648941766 is an abundant number, since it is smaller than the sum of its proper divisors (803290170).

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

648941766 is a wasteful number, since it uses less digits than its factorization.

648941766 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1637.

The product of its digits is 1741824, while the sum is 51.

The square root of 648941766 is about 25474.3354378480. The cubic root of 648941766 is about 865.7687558058.

The spelling of 648941766 in words is "six hundred forty-eight million, nine hundred forty-one thousand, seven hundred sixty-six".