6731615640 has 128 divisors (see below), whose sum is σ = 21282912000. Its totient is φ = 1698605568.

The previous prime is 6731615599. The next prime is 6731615641. The reversal of 6731615640 is 465161376.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6731615641) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3252526 + ... + 3254594.

It is an arithmetic number, because the mean of its divisors is an integer number (166272750).

Almost surely, 2^6731615640 is an apocalyptic number.

6731615640 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 6731615640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (10641456000).

6731615640 is an abundant number, since it is smaller than the sum of its proper divisors (14551296360).

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

6731615640 is a wasteful number, since it uses less digits than its factorization.

6731615640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3529 (or 3525 counting only the distinct ones).

The product of its (nonzero) digits is 90720, while the sum is 39.

The square root of 6731615640 is about 82046.4236880560. The cubic root of 6731615640 is about 1888.1642487037.

The spelling of 6731615640 in words is "six billion, seven hundred thirty-one million, six hundred fifteen thousand, six hundred forty".