731673646021890 has 384 divisors, whose sum is σ = 2352777236409600. Its totient is φ = 155099302225920.

The previous prime is 731673646021831. The next prime is 731673646021987. The reversal of 731673646021890 is 98120646376137.

It is a happy number.

731673646021890 is a `hidden beast` number, since 7 + 3 + 1 + 6 + 7 + 3 + 6 + 4 + 602 + 18 + 9 + 0 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 2737868796 + ... + 2738136024.

It is an arithmetic number, because the mean of its divisors is an integer number (6127024053150).

Almost surely, 2^{731673646021890} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 731673646021890, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1176388618204800).

731673646021890 is an abundant number, since it is smaller than the sum of its proper divisors (1621103590387710).

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

731673646021890 is a wasteful number, since it uses less digits than its factorization.

731673646021890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 278482 (or 278479 counting only the distinct ones).

The product of its (nonzero) digits is 54867456, while the sum is 63.

The spelling of 731673646021890 in words is "seven hundred thirty-one trillion, six hundred seventy-three billion, six hundred forty-six million, twenty-one thousand, eight hundred ninety".