721424880 has 400 divisors, whose sum is σ = 2835756000. Its totient is φ = 168376320.

The previous prime is 721424867. The next prime is 721424887. The reversal of 721424880 is 88424127.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (721424887) by changing a digit.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 2066946 + ... + 2067294.

It is an arithmetic number, because the mean of its divisors is an integer number (7089390).

Almost surely, 2^721424880 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 721424880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1417878000).

721424880 is an abundant number, since it is smaller than the sum of its proper divisors (2114331120).

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

721424880 is a wasteful number, since it uses less digits than its factorization.

721424880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 414 (or 399 counting only the distinct ones).

The product of its (nonzero) digits is 28672, while the sum is 36.

The square root of 721424880 is about 26859.3536780020. The cubic root of 721424880 is about 896.8718063802.

The spelling of 721424880 in words is "seven hundred twenty-one million, four hundred twenty-four thousand, eight hundred eighty".