648645512 has 8 divisors (see below), whose sum is σ = 1216210350. Its totient is φ = 324322752.

The previous prime is 648645509. The next prime is 648645539. The reversal of 648645512 is 215546846.

It can be written as a sum of positive squares in only one way, i.e., 366875716 + 281769796 = 19154^2 + 16786^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a self number, because there is not a number n which added to its sum of digits gives 648645512.

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 as a sum of consecutive naturals, namely, 40540337 + ... + 40540352.

Almost surely, 2^648645512 is an apocalyptic number.

It is an amenable number.

648645512 is a deficient number, since it is larger than the sum of its proper divisors (567564838).

648645512 is a wasteful number, since it uses less digits than its factorization.

648645512 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81080695 (or 81080691 counting only the distinct ones).

The product of its digits is 230400, while the sum is 41.

The square root of 648645512 is about 25468.5200198205. The cubic root of 648645512 is about 865.6369892330.

The spelling of 648645512 in words is "six hundred forty-eight million, six hundred forty-five thousand, five hundred twelve".