721683441 has 48 divisors (see below), whose sum is σ = 1144000000. Its totient is φ = 436700160.

The previous prime is 721683419. The next prime is 721683461. The reversal of 721683441 is 144386127.

It is not a de Polignac number, because 721683441 - 2¹⁴ = 721667057 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 721683396 and 721683405.

It is not an unprimeable number, because it can be changed into a prime (721683401) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 577185 + ... + 578433.

Almost surely, 2^721683441 is an apocalyptic number.

It is an amenable number.

721683441 is a deficient number, since it is larger than the sum of its proper divisors (422316559).

721683441 is a wasteful number, since it uses less digits than its factorization.

721683441 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1414 (or 1411 counting only the distinct ones).

The product of its digits is 32256, while the sum is 36.

The square root of 721683441 is about 26864.1664862322. The cubic root of 721683441 is about 896.9789408299.

The spelling of 721683441 in words is "seven hundred twenty-one million, six hundred eighty-three thousand, four hundred forty-one".