731261921280 has 768 divisors, whose sum is σ = 2679883315200. Its totient is φ = 168591360000.

The previous prime is 731261921263. The next prime is 731261921281. The reversal of 731261921280 is 82129162137.

It is a tau number, because it is divible by the number of its divisors (768).

It is not an unprimeable number, because it can be changed into a prime (731261921281) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 695776755 + ... + 695777805.

It is an arithmetic number, because the mean of its divisors is an integer number (3489431400).

Almost surely, 2^731261921280 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 731261921280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1339941657600).

731261921280 is an abundant number, since it is smaller than the sum of its proper divisors (1948621393920).

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

731261921280 is a wasteful number, since it uses less digits than its factorization.

731261921280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1192 (or 1172 counting only the distinct ones).

The product of its (nonzero) digits is 72576, while the sum is 42.

The spelling of 731261921280 in words is "seven hundred thirty-one billion, two hundred sixty-one million, nine hundred twenty-one thousand, two hundred eighty".