720649737 has 16 divisors (see below), whose sum is σ = 1130431680. Its totient is φ = 452172096.

The previous prime is 720649723. The next prime is 720649753. The reversal of 720649737 is 737946027.

It is a happy number.

720649737 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 720649737 - 2⁶ = 720649673 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 720649692 and 720649701.

It is not an unprimeable number, because it can be changed into a prime (720649757) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 784563 + ... + 785480.

It is an arithmetic number, because the mean of its divisors is an integer number (70651980).

Almost surely, 2^720649737 is an apocalyptic number.

It is an amenable number.

720649737 is a deficient number, since it is larger than the sum of its proper divisors (409781943).

720649737 is a wasteful number, since it uses less digits than its factorization.

720649737 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1570069 (or 1570063 counting only the distinct ones).

The product of its (nonzero) digits is 444528, while the sum is 45.

The square root of 720649737 is about 26844.9201339844. The cubic root of 720649737 is about 896.5504732978.

The spelling of 720649737 in words is "seven hundred twenty million, six hundred forty-nine thousand, seven hundred thirty-seven".