721066005 has 48 divisors (see below), whose sum is σ = 1410514560. Its totient is φ = 337545600.

The previous prime is 721066001. The next prime is 721066009. The reversal of 721066005 is 500660127.

721066005 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (721066001) and next prime (721066009).

It is not a de Polignac number, because 721066005 - 2² = 721066001 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 721066005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (721066001) 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, 10761 + ... + 39470.

It is an arithmetic number, because the mean of its divisors is an integer number (29385720).

Almost surely, 2^721066005 is an apocalyptic number.

It is an amenable number.

721066005 is a deficient number, since it is larger than the sum of its proper divisors (689448555).

721066005 is a wasteful number, since it uses less digits than its factorization.

721066005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50282 (or 50279 counting only the distinct ones).

The product of its (nonzero) digits is 2520, while the sum is 27.

The square root of 721066005 is about 26852.6722133943. The cubic root of 721066005 is about 896.7230645111.

It can be divided in two parts, 7 and 21066005, that added together give a palindrome (21066012).

The spelling of 721066005 in words is "seven hundred twenty-one million, sixty-six thousand, five".