720551745 has 24 divisors (see below), whose sum is σ = 1258500672. Its totient is φ = 381357600.

The previous prime is 720551729. The next prime is 720551761. The reversal of 720551745 is 547155027.

It is an interprime number because it is at equal distance from previous prime (720551729) and next prime (720551761).

It is not a de Polignac number, because 720551745 - 2⁴ = 720551729 is a prime.

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 23 ways as a sum of consecutive naturals, for example, 55221 + ... + 67010.

It is an arithmetic number, because the mean of its divisors is an integer number (52437528).

Almost surely, 2^720551745 is an apocalyptic number.

It is an amenable number.

720551745 is a deficient number, since it is larger than the sum of its proper divisors (537948927).

720551745 is a wasteful number, since it uses less digits than its factorization.

720551745 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 122373 (or 122370 counting only the distinct ones).

The product of its (nonzero) digits is 49000, while the sum is 36.

The square root of 720551745 is about 26843.0949221583. The cubic root of 720551745 is about 896.5098346205.

The spelling of 720551745 in words is "seven hundred twenty million, five hundred fifty-one thousand, seven hundred forty-five".