720394100 has 18 divisors (see below), whose sum is σ = 1563255414. Its totient is φ = 288157600.

The previous prime is 720394099. The next prime is 720394111. The reversal of 720394100 is 1493027.

It can be written as a sum of positive squares in 3 ways, for example, as 34058896 + 686335204 = 5836^2 + 26198^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 720394100.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3601871 + ... + 3602070.

It is an arithmetic number, because the mean of its divisors is an integer number (86847523).

Almost surely, 2^720394100 is an apocalyptic number.

It is an amenable number.

720394100 is an abundant number, since it is smaller than the sum of its proper divisors (842861314).

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

720394100 is a wasteful number, since it uses less digits than its factorization.

720394100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7203955 (or 7203948 counting only the distinct ones).

The product of its (nonzero) digits is 1512, while the sum is 26.

The square root of 720394100 is about 26840.1583452855. The cubic root of 720394100 is about 896.4444492626. Note that the first 5 decimals are identical.

The spelling of 720394100 in words is "seven hundred twenty million, three hundred ninety-four thousand, one hundred".