721335612 has 12 divisors (see below), whose sum is σ = 1683116456. Its totient is φ = 240445200.

The previous prime is 721335599. The next prime is 721335661. The reversal of 721335612 is 216533127.

It is a tau number, because it is divible by the number of its divisors (12).

It is a self number, because there is not a number n which added to its sum of digits gives 721335612.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 30055639 + ... + 30055662.

Almost surely, 2^721335612 is an apocalyptic number.

It is an amenable number.

721335612 is an abundant number, since it is smaller than the sum of its proper divisors (961780844).

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

721335612 is a wasteful number, since it uses less digits than its factorization.

721335612 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60111308 (or 60111306 counting only the distinct ones).

The product of its digits is 7560, while the sum is 30.

The square root of 721335612 is about 26857.6918591304. The cubic root of 721335612 is about 896.8348123438.

Adding to 721335612 its reverse (216533127), we get a palindrome (937868739).

The spelling of 721335612 in words is "seven hundred twenty-one million, three hundred thirty-five thousand, six hundred twelve".