648403140 has 192 divisors, whose sum is σ = 2275983360. Its totient is φ = 133992960.

The previous prime is 648403127. The next prime is 648403163. The reversal of 648403140 is 41304846.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 648403098 and 648403107.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1353421 + ... + 1353899.

It is an arithmetic number, because the mean of its divisors is an integer number (11854080).

Almost surely, 2^648403140 is an apocalyptic number.

648403140 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 648403140, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1137991680).

648403140 is an abundant number, since it is smaller than the sum of its proper divisors (1627580220).

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

648403140 is a wasteful number, since it uses less digits than its factorization.

648403140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 802 (or 800 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 30.

The square root of 648403140 is about 25463.7613089661. The cubic root of 648403140 is about 865.5291582211.

Adding to 648403140 its reverse (41304846), we get a palindrome (689707986).

The spelling of 648403140 in words is "six hundred forty-eight million, four hundred three thousand, one hundred forty".