731123648442 has 192 divisors, whose sum is σ = 1811059084800. Its totient is φ = 221165303040.

The previous prime is 731123648393. The next prime is 731123648477. The reversal of 731123648442 is 244846321137.

731123648442 is a `hidden beast` number, since 7 + 3 + 1 + 123 + 6 + 484 + 42 = 666.

It is a super-2 number, since 2×731123648442² (a number of 25 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 491676223 + ... + 491677709.

It is an arithmetic number, because the mean of its divisors is an integer number (9432599400).

Almost surely, 2^731123648442 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 731123648442, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (905529542400).

731123648442 is an abundant number, since it is smaller than the sum of its proper divisors (1079935436358).

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

731123648442 is a wasteful number, since it uses less digits than its factorization.

731123648442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2461 (or 2432 counting only the distinct ones).

The product of its digits is 774144, while the sum is 45.

Adding to 731123648442 its reverse (244846321137), we get a palindrome (975969969579).

The spelling of 731123648442 in words is "seven hundred thirty-one billion, one hundred twenty-three million, six hundred forty-eight thousand, four hundred forty-two".