648930135844 has 243 divisors, whose sum is σ = 1349988783507. Its totient is φ = 272834182656.

The previous prime is 648930135817. The next prime is 648930135853. The reversal of 648930135844 is 448531039846.

The square root of 648930135844 is 805562.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 4 ways, for example, as 64145692900 + 584784442944 = 253270^2 + 764712^2 .

It is a super-2 number, since 2×648930135844² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 80 ways as a sum of consecutive naturals, for example, 15091398487 + ... + 15091398529.

Almost surely, 2^648930135844 is an apocalyptic number.

648930135844 is the 805562-nd square number.

It is an amenable number.

648930135844 is an abundant number, since it is smaller than the sum of its proper divisors (701058647663).

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

648930135844 is a wasteful number, since it uses less digits than its factorization.

648930135844 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 220 (or 110 counting only the distinct ones).

The product of its (nonzero) digits is 9953280, while the sum is 55.

The spelling of 648930135844 in words is "six hundred forty-eight billion, nine hundred thirty million, one hundred thirty-five thousand, eight hundred forty-four".