720810900 has 108 divisors (see below), whose sum is σ = 2343100032. Its totient is φ = 192209760.

The previous prime is 720810899. The next prime is 720810913. The reversal of 720810900 is 9018027.

It is a tau number, because it is divible by the number of its divisors (108).

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 9469 + ... + 39131.

Almost surely, 2^720810900 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 720810900, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1171550016).

720810900 is an abundant number, since it is smaller than the sum of its proper divisors (1622289132).

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

720810900 is a wasteful number, since it uses less digits than its factorization.

720810900 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29692 (or 29673 counting only the distinct ones).

The product of its (nonzero) digits is 1008, while the sum is 27.

The square root of 720810900 is about 26847.9217072756. The cubic root of 720810900 is about 896.6173018770.

Adding to 720810900 its reverse (9018027), we get a palindrome (729828927).

The spelling of 720810900 in words is "seven hundred twenty million, eight hundred ten thousand, nine hundred".