721680980 has 18 divisors (see below), whose sum is σ = 1515782394. Its totient is φ = 288624336.

The previous prime is 721680937. The next prime is 721680983. The reversal of 721680980 is 89086127.

721680980 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 577344784 + 144336196 = 24028^2 + 12014^2 .

It is a super-3 number, since 3×721680980³ (a number of 28 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (721680983) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 117137 + ... + 123143.

It is an arithmetic number, because the mean of its divisors is an integer number (84210133).

Almost surely, 2^721680980 is an apocalyptic number.

It is an amenable number.

721680980 is an abundant number, since it is smaller than the sum of its proper divisors (794101414).

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

721680980 is an frugal number, since it uses more digits than its factorization.

721680980 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12023 (or 6014 counting only the distinct ones).

The product of its (nonzero) digits is 48384, while the sum is 41.

The square root of 721680980 is about 26864.1206816825. The cubic root of 721680980 is about 896.9779212380.

The spelling of 721680980 in words is "seven hundred twenty-one million, six hundred eighty thousand, nine hundred eighty".