721341028 has 12 divisors (see below), whose sum is σ = 1281188272. Its totient is φ = 355287240.

The previous prime is 721341001. The next prime is 721341029. The reversal of 721341028 is 820143127.

It is a junction number, because it is equal to n+sod(n) for n = 721340987 and 721341005.

It is not an unprimeable number, because it can be changed into a prime (721341029) 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 3 ways as a sum of consecutive naturals, for example, 1345518 + ... + 1346053.

Almost surely, 2^721341028 is an apocalyptic number.

It is an amenable number.

721341028 is a deficient number, since it is larger than the sum of its proper divisors (559847244).

721341028 is a wasteful number, since it uses less digits than its factorization.

721341028 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2691642 (or 2691640 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 28.

The square root of 721341028 is about 26857.7926866673. The cubic root of 721341028 is about 896.8370569047.

The spelling of 721341028 in words is "seven hundred twenty-one million, three hundred forty-one thousand, twenty-eight".