720542165 has 16 divisors (see below), whose sum is σ = 997771008. Its totient is φ = 489286656.

The previous prime is 720542153. The next prime is 720542171. The reversal of 720542165 is 561245027.

It is a cyclic number.

It is not a de Polignac number, because 720542165 - 2²⁰ = 719493589 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 96332 + ... + 103541.

It is an arithmetic number, because the mean of its divisors is an integer number (62360688).

Almost surely, 2^720542165 is an apocalyptic number.

It is an amenable number.

720542165 is a deficient number, since it is larger than the sum of its proper divisors (277228843).

720542165 is a wasteful number, since it uses less digits than its factorization.

720542165 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 199988.

The product of its (nonzero) digits is 16800, while the sum is 32.

The square root of 720542165 is about 26842.9164771640. The cubic root of 720542165 is about 896.5058614604.

The spelling of 720542165 in words is "seven hundred twenty million, five hundred forty-two thousand, one hundred sixty-five".