720802521 has 12 divisors (see below), whose sum is σ = 1043235648. Its totient is φ = 479576664.

The previous prime is 720802501. The next prime is 720802529. The reversal of 720802521 is 125208027.

It is not a de Polignac number, because 720802521 - 2⁷ = 720802393 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (720802529) 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 11 ways as a sum of consecutive naturals, for example, 75085 + ... + 84138.

It is an arithmetic number, because the mean of its divisors is an integer number (86936304).

Almost surely, 2^720802521 is an apocalyptic number.

It is an amenable number.

720802521 is a deficient number, since it is larger than the sum of its proper divisors (322433127).

720802521 is a wasteful number, since it uses less digits than its factorization.

720802521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 159732 (or 159729 counting only the distinct ones).

The product of its (nonzero) digits is 2240, while the sum is 27.

The square root of 720802521 is about 26847.7656612240. The cubic root of 720802521 is about 896.6138276485.

The spelling of 720802521 in words is "seven hundred twenty million, eight hundred two thousand, five hundred twenty-one".