720021359 has 6 divisors (see below), whose sum is σ = 759912120. Its totient is φ = 682125156.

The previous prime is 720021353. The next prime is 720021373. The reversal of 720021359 is 953120027.

It is not a de Polignac number, because 720021359 - 2⁴ = 720021343 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 (720021353) 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 5 ways as a sum of consecutive naturals, for example, 996899 + ... + 997620.

It is an arithmetic number, because the mean of its divisors is an integer number (126652020).

Almost surely, 2^720021359 is an apocalyptic number.

720021359 is a deficient number, since it is larger than the sum of its proper divisors (39890761).

720021359 is a wasteful number, since it uses less digits than its factorization.

720021359 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1994557 (or 1994538 counting only the distinct ones).

The product of its (nonzero) digits is 3780, while the sum is 29.

The square root of 720021359 is about 26833.2137285119. The cubic root of 720021359 is about 896.2898120316.

The spelling of 720021359 in words is "seven hundred twenty million, twenty-one thousand, three hundred fifty-nine".