721044730 has 16 divisors (see below), whose sum is σ = 1483292160. Its totient is φ = 247215312.

The previous prime is 721044707. The next prime is 721044739. The reversal of 721044730 is 37440127.

It is not an unprimeable number, because it can be changed into a prime (721044739) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5150250 + ... + 5150389.

It is an arithmetic number, because the mean of its divisors is an integer number (92705760).

Almost surely, 2^721044730 is an apocalyptic number.

721044730 is a gapful number since it is divisible by the number (70) formed by its first and last digit.

721044730 is an abundant number, since it is smaller than the sum of its proper divisors (762247430).

721044730 is a wasteful number, since it uses less digits than its factorization.

721044730 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10300653.

The product of its (nonzero) digits is 4704, while the sum is 28.

The square root of 721044730 is about 26852.2760674026. The cubic root of 721044730 is about 896.7142451748.

Adding to 721044730 its reverse (37440127), we get a palindrome (758484857).

The spelling of 721044730 in words is "seven hundred twenty-one million, forty-four thousand, seven hundred thirty".