731911811040 has 144 divisors (see below), whose sum is σ = 2498591113200. Its totient is φ = 195102867456.

The previous prime is 731911811023. The next prime is 731911811041. The reversal of 731911811040 is 40118119137.

It is a tau number, because it is divible by the number of its divisors (144).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 731911810986 and 731911811004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (731911811041) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3777651 + ... + 3966669.

It is an arithmetic number, because the mean of its divisors is an integer number (17351327175).

Almost surely, 2^731911811040 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 731911811040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1249295556600).

731911811040 is an abundant number, since it is smaller than the sum of its proper divisors (1766679302160).

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

731911811040 is a wasteful number, since it uses less digits than its factorization.

731911811040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 191729 (or 191718 counting only the distinct ones).

The product of its (nonzero) digits is 6048, while the sum is 36.

The spelling of 731911811040 in words is "seven hundred thirty-one billion, nine hundred eleven million, eight hundred eleven thousand, forty".