729921320 has 16 divisors (see below), whose sum is σ = 1642323060. Its totient is φ = 291968512.

The previous prime is 729921317. The next prime is 729921331. The reversal of 729921320 is 23129927.

It can be written as a sum of positive squares in 2 ways, for example, as 687593284 + 42328036 = 26222^2 + 6506^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9123977 + ... + 9124056.

Almost surely, 2^729921320 is an apocalyptic number.

It is an amenable number.

729921320 is an abundant number, since it is smaller than the sum of its proper divisors (912401740).

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

729921320 is a wasteful number, since it uses less digits than its factorization.

729921320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18248044 (or 18248040 counting only the distinct ones).

The product of its (nonzero) digits is 13608, while the sum is 35.

The square root of 729921320 is about 27017.0560942528. The cubic root of 729921320 is about 900.3789844225.

The spelling of 729921320 in words is "seven hundred twenty-nine million, nine hundred twenty-one thousand, three hundred twenty".