6640875240 has 256 divisors, whose sum is σ = 21542008320. Its totient is φ = 1631846400.

The previous prime is 6640875217. The next prime is 6640875281. The reversal of 6640875240 is 425780466.

It is a junction number, because it is equal to n+sod(n) for n = 6640875192 and 6640875201.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 34408584 + ... + 34408776.

It is an arithmetic number, because the mean of its divisors is an integer number (84148470).

Almost surely, 2^6640875240 is an apocalyptic number.

6640875240 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 6640875240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (10771004160).

6640875240 is an abundant number, since it is smaller than the sum of its proper divisors (14901133080).

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

6640875240 is a wasteful number, since it uses less digits than its factorization.

6640875240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 492 (or 488 counting only the distinct ones).

The product of its (nonzero) digits is 322560, while the sum is 42.

The square root of 6640875240 is about 81491.5654531191. The cubic root of 6640875240 is about 1879.6418549697.

The spelling of 6640875240 in words is "six billion, six hundred forty million, eight hundred seventy-five thousand, two hundred forty".