721409696 has 24 divisors (see below), whose sum is σ = 1623172320. Its totient is φ = 309175488.

The previous prime is 721409687. The next prime is 721409699. The reversal of 721409696 is 696904127.

It is a super-3 number, since 3×721409696³ (a number of 28 digits) contains 333 as substring.

It is a zygodrome in base 4.

It is not an unprimeable number, because it can be changed into a prime (721409699) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1610066 + ... + 1610513.

It is an arithmetic number, because the mean of its divisors is an integer number (67632180).

Almost surely, 2^721409696 is an apocalyptic number.

It is an amenable number.

721409696 is an abundant number, since it is smaller than the sum of its proper divisors (901762624).

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

721409696 is a wasteful number, since it uses less digits than its factorization.

721409696 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3220596 (or 3220588 counting only the distinct ones).

The product of its (nonzero) digits is 163296, while the sum is 44.

The square root of 721409696 is about 26859.0710189314. The cubic root of 721409696 is about 896.8655141117.

The spelling of 721409696 in words is "seven hundred twenty-one million, four hundred nine thousand, six hundred ninety-six".