721444430 has 16 divisors (see below), whose sum is σ = 1484114400. Its totient is φ = 247352352.

The previous prime is 721444429. The next prime is 721444439. The reversal of 721444430 is 34444127.

It is a junction number, because it is equal to n+sod(n) for n = 721444393 and 721444402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (721444439) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5153105 + ... + 5153244.

It is an arithmetic number, because the mean of its divisors is an integer number (92757150).

Almost surely, 2^721444430 is an apocalyptic number.

721444430 is a gapful number since it is divisible by the number (70) formed by its first and last digit.

721444430 is an abundant number, since it is smaller than the sum of its proper divisors (762669970).

721444430 is a wasteful number, since it uses less digits than its factorization.

721444430 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10306363.

The product of its (nonzero) digits is 10752, while the sum is 29.

The square root of 721444430 is about 26859.7176083443. The cubic root of 721444430 is about 896.8799077945.

Adding to 721444430 its reverse (34444127), we get a palindrome (755888557).

The spelling of 721444430 in words is "seven hundred twenty-one million, four hundred forty-four thousand, four hundred thirty".