720810973 has 4 divisors (see below), whose sum is σ = 721276668. Its totient is φ = 720345280.

The previous prime is 720810947. The next prime is 720811009. The reversal of 720810973 is 379018027.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 38713284 + 682097689 = 6222^2 + 26117^2 .

It is a cyclic number.

It is not a de Polignac number, because 720810973 - 2¹⁷ = 720679901 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (720810913) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 230518 + ... + 233623.

It is an arithmetic number, because the mean of its divisors is an integer number (180319167).

Almost surely, 2^720810973 is an apocalyptic number.

It is an amenable number.

720810973 is a deficient number, since it is larger than the sum of its proper divisors (465695).

720810973 is a wasteful number, since it uses less digits than its factorization.

720810973 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 465694.

The product of its (nonzero) digits is 21168, while the sum is 37.

The square root of 720810973 is about 26847.9230667849. The cubic root of 720810973 is about 896.6173321453.

It can be divided in two parts, 7208 and 10973, that added together give a palindrome (18181).

The spelling of 720810973 in words is "seven hundred twenty million, eight hundred ten thousand, nine hundred seventy-three".