720450 has 36 divisors (see below), whose sum is σ = 1936818. Its totient is φ = 192000.

The previous prime is 720439. The next prime is 720481. The reversal of 720450 is 54027.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 700569 + 19881 = 837^2 + 141^2 .

It is a hoax number, since the sum of its digits (18) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 351 + ... + 1250.

2⁷²⁰⁴⁵⁰ is an apocalyptic number.

720450 is an abundant number, since it is smaller than the sum of its proper divisors (1216368).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

720450 is a wasteful number, since it uses less digits than its factorization.

720450 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1619 (or 1611 counting only the distinct ones).

The product of its (nonzero) digits is 280, while the sum is 18.

The square root of 720450 is about 848.7932610477. The cubic root of 720450 is about 89.6467635622.

Adding to 720450 its reverse (54027), we get a palindrome (774477).

The spelling of 720450 in words is "seven hundred twenty thousand, four hundred fifty".