720221611 has 8 divisors (see below), whose sum is σ = 734851440. Its totient is φ = 705630432.

The previous prime is 720221573. The next prime is 720221633. The reversal of 720221611 is 116122027.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 720221611 - 2¹³ = 720213419 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (720221651) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 29580 + ... + 48118.

It is an arithmetic number, because the mean of its divisors is an integer number (91856430).

Almost surely, 2^720221611 is an apocalyptic number.

720221611 is a deficient number, since it is larger than the sum of its proper divisors (14629829).

720221611 is a wasteful number, since it uses less digits than its factorization.

720221611 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19325.

The product of its (nonzero) digits is 336, while the sum is 22.

The square root of 720221611 is about 26836.9448894616. The cubic root of 720221611 is about 896.3728962292.

Adding to 720221611 its reverse (116122027), we get a palindrome (836343638).

The spelling of 720221611 in words is "seven hundred twenty million, two hundred twenty-one thousand, six hundred eleven".