721027980 has 120 divisors (see below), whose sum is σ = 2275313040. Its totient is φ = 191134080.

The previous prime is 721027973. The next prime is 721027981. The reversal of 721027980 is 89720127.

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

It is not an unprimeable number, because it can be changed into a prime (721027981) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 291991 + ... + 294449.

It is an arithmetic number, because the mean of its divisors is an integer number (18960942).

Almost surely, 2^721027980 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 721027980, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1137656520).

721027980 is an abundant number, since it is smaller than the sum of its proper divisors (1554285060).

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

721027980 is a wasteful number, since it uses less digits than its factorization.

721027980 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2661 (or 2650 counting only the distinct ones).

The product of its (nonzero) digits is 14112, while the sum is 36.

The square root of 721027980 is about 26851.9641739669. The cubic root of 721027980 is about 896.7073015094.

The spelling of 721027980 in words is "seven hundred twenty-one million, twenty-seven thousand, nine hundred eighty".