720215900 has 72 divisors (see below), whose sum is σ = 1665310080. Its totient is φ = 269576640.

The previous prime is 720215893. The next prime is 720215911. The reversal of 720215900 is 9512027.

It is a super-2 number, since 2×720215900² = 1037421885225620000, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 720215900.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 155417 + ... + 159983.

Almost surely, 2^720215900 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 720215900, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (832655040).

720215900 is an abundant number, since it is smaller than the sum of its proper divisors (945094180).

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

720215900 is a wasteful number, since it uses less digits than its factorization.

720215900 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4683 (or 4676 counting only the distinct ones).

The product of its (nonzero) digits is 1260, while the sum is 26.

The square root of 720215900 is about 26836.8384874225. The cubic root of 720215900 is about 896.3705269589.

Adding to 720215900 its reverse (9512027), we get a palindrome (729727927).

The spelling of 720215900 in words is "seven hundred twenty million, two hundred fifteen thousand, nine hundred".