720737 has 6 divisors (see below), whose sum is σ = 747318. Its totient is φ = 695072.

The previous prime is 720703. The next prime is 720743. The reversal of 720737 is 737027.

It can be written as a sum of positive squares in 3 ways, for example, as 279841 + 440896 = 529^2 + 664^2 .

It is not a de Polignac number, because 720737 - 2⁸ = 720481 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (720767) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 413 + ... + 1269.

It is an arithmetic number, because the mean of its divisors is an integer number (124553).

2⁷²⁰⁷³⁷ is an apocalyptic number.

It is an amenable number.

720737 is a deficient number, since it is larger than the sum of its proper divisors (26581).

720737 is an equidigital number, since it uses as much as digits as its factorization.

720737 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 915 (or 886 counting only the distinct ones).

The product of its (nonzero) digits is 2058, while the sum is 26.

The square root of 720737 is about 848.9623077617. The cubic root of 720737 is about 89.6586659405.

Subtracting 720737 from its reverse (737027), we obtain a triangular number (16290 = T₁₈₀).

The spelling of 720737 in words is "seven hundred twenty thousand, seven hundred thirty-seven".