648951808 has 72 divisors (see below), whose sum is σ = 1358721000. Its totient is φ = 309850112.

The previous prime is 648951757. The next prime is 648951827. The reversal of 648951808 is 808159846.

It is a super-2 number, since 2×648951808² = 842276898212937728, 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 (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1083093 + ... + 1083691.

It is an arithmetic number, because the mean of its divisors is an integer number (18871125).

Almost surely, 2^648951808 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 648951808, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (679360500).

648951808 is an abundant number, since it is smaller than the sum of its proper divisors (709769192).

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

648951808 is an equidigital number, since it uses as much as digits as its factorization.

648951808 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 667 (or 624 counting only the distinct ones).

The product of its (nonzero) digits is 552960, while the sum is 49.

The square root of 648951808 is about 25474.5325374186. The cubic root of 648951808 is about 865.7732215403.

The spelling of 648951808 in words is "six hundred forty-eight million, nine hundred fifty-one thousand, eight hundred eight".