720445 has 8 divisors (see below), whose sum is σ = 943200. Its totient is φ = 523920.

The previous prime is 720439. The next prime is 720481. The reversal of 720445 is 544027.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 720445 - 2⁵ = 720413 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6495 + ... + 6604.

It is an arithmetic number, because the mean of its divisors is an integer number (117900).

2⁷²⁰⁴⁴⁵ is an apocalyptic number.

It is an amenable number.

720445 is a deficient number, since it is larger than the sum of its proper divisors (222755).

720445 is a wasteful number, since it uses less digits than its factorization.

720445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13115.

The product of its (nonzero) digits is 1120, while the sum is 22.

The square root of 720445 is about 848.7903156846. The cubic root of 720445 is about 89.6465561756.

It can be divided in two parts, 720 and 445, that multiplied together give a triangular number (320400 = T₈₀₀).

The spelling of 720445 in words is "seven hundred twenty thousand, four hundred forty-five".