721049690880 has 432 divisors, whose sum is σ = 2632560315840. Its totient is φ = 181847457792.

The previous prime is 721049690869. The next prime is 721049690887. The reversal of 721049690880 is 88096940127.

721049690880 is a `hidden beast` number, since 72 + 1 + 0 + 496 + 9 + 0 + 8 + 80 = 666.

It is a hoax number, since the sum of its digits (54) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (721049690887) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 23566152 + ... + 23596728.

It is an arithmetic number, because the mean of its divisors is an integer number (6093889620).

Almost surely, 2^721049690880 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 721049690880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1316280157920).

721049690880 is an abundant number, since it is smaller than the sum of its proper divisors (1911510624960).

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

721049690880 is a wasteful number, since it uses less digits than its factorization.

721049690880 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30716 (or 30699 counting only the distinct ones).

The product of its (nonzero) digits is 1741824, while the sum is 54.

The spelling of 721049690880 in words is "seven hundred twenty-one billion, forty-nine million, six hundred ninety thousand, eight hundred eighty".