6640734480 has 240 divisors, whose sum is σ = 22210393920. Its totient is φ = 1640669184.

The previous prime is 6640734461. The next prime is 6640734493. The reversal of 6640734480 is 844370466.

It is a tau number, because it is divible by the number of its divisors (240).

It is a congruent number.

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 in 47 ways as a sum of consecutive naturals, for example, 4646406 + ... + 4647834.

It is an arithmetic number, because the mean of its divisors is an integer number (92543308).

Almost surely, 2^6640734480 is an apocalyptic number.

6640734480 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 6640734480, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (11105196960).

6640734480 is an abundant number, since it is smaller than the sum of its proper divisors (15569659440).

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

6640734480 is a wasteful number, since it uses less digits than its factorization.

6640734480 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1546 (or 1523 counting only the distinct ones).

The product of its (nonzero) digits is 387072, while the sum is 42.

The square root of 6640734480 is about 81490.7018008803. The cubic root of 6640734480 is about 1879.6285745789.

The spelling of 6640734480 in words is "six billion, six hundred forty million, seven hundred thirty-four thousand, four hundred eighty".