721066285 has 4 divisors (see below), whose sum is σ = 865279548. Its totient is φ = 576853024.

The previous prime is 721066277. The next prime is 721066289. The reversal of 721066285 is 582660127.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 73770921 + 647295364 = 8589^2 + 25442^2 .

It is a cyclic number.

It is not a de Polignac number, because 721066285 - 2³ = 721066277 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (721066289) 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, 72106624 + ... + 72106633.

It is an arithmetic number, because the mean of its divisors is an integer number (216319887).

Almost surely, 2^721066285 is an apocalyptic number.

It is an amenable number.

721066285 is a deficient number, since it is larger than the sum of its proper divisors (144213263).

721066285 is a wasteful number, since it uses less digits than its factorization.

721066285 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 144213262.

The product of its (nonzero) digits is 40320, while the sum is 37.

The square root of 721066285 is about 26852.6774270276. The cubic root of 721066285 is about 896.7231805811.

The spelling of 721066285 in words is "seven hundred twenty-one million, sixty-six thousand, two hundred eighty-five".