648693640 has 64 divisors (see below), whose sum is σ = 1672335360. Its totient is φ = 221840640.

The previous prime is 648693637. The next prime is 648693641. The reversal of 648693640 is 46396846.

It is not an unprimeable number, because it can be changed into a prime (648693641) 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 15 ways as a sum of consecutive naturals, for example, 115129 + ... + 120631.

It is an arithmetic number, because the mean of its divisors is an integer number (26130240).

Almost surely, 2^648693640 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 648693640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (836167680).

648693640 is an abundant number, since it is smaller than the sum of its proper divisors (1023641720).

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

648693640 is a wasteful number, since it uses less digits than its factorization.

648693640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5942 (or 5938 counting only the distinct ones).

The product of its (nonzero) digits is 746496, while the sum is 46.

The square root of 648693640 is about 25469.4648549984. The cubic root of 648693640 is about 865.6583981258.

It can be divided in two parts, 6 and 48693640, that added together give a triangular number (48693646 = T₉₈₆₈).

The spelling of 648693640 in words is "six hundred forty-eight million, six hundred ninety-three thousand, six hundred forty".