721384704 has 180 divisors, whose sum is σ = 2265487840. Its totient is φ = 227681280.

The previous prime is 721384693. The next prime is 721384721. The reversal of 721384704 is 407483127.

It is a happy number.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 393069 + ... + 394899.

Almost surely, 2^721384704 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 721384704, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1132743920).

721384704 is an abundant number, since it is smaller than the sum of its proper divisors (1544103136).

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

721384704 is a wasteful number, since it uses less digits than its factorization.

721384704 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1878 (or 1855 counting only the distinct ones).

The product of its (nonzero) digits is 37632, while the sum is 36.

The square root of 721384704 is about 26858.6057717075. The cubic root of 721384704 is about 896.8551572036.

The spelling of 721384704 in words is "seven hundred twenty-one million, three hundred eighty-four thousand, seven hundred four".