731316731640 has 256 divisors, whose sum is σ = 2409409152000. Its totient is φ = 176107130880.

The previous prime is 731316731609. The next prime is 731316731659. The reversal of 731316731640 is 46137613137.

It is a super-2 number, since 2×731316731640² (a number of 25 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 731316731592 and 731316731601.

It is a congruent number.

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, 127470852 + ... + 127476588.

It is an arithmetic number, because the mean of its divisors is an integer number (9411754500).

Almost surely, 2^731316731640 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 731316731640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1204704576000).

731316731640 is an abundant number, since it is smaller than the sum of its proper divisors (1678092420360).

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

731316731640 is a wasteful number, since it uses less digits than its factorization.

731316731640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6390 (or 6386 counting only the distinct ones).

The product of its (nonzero) digits is 190512, while the sum is 42.

The spelling of 731316731640 in words is "seven hundred thirty-one billion, three hundred sixteen million, seven hundred thirty-one thousand, six hundred forty".