720900400 has 60 divisors (see below), whose sum is σ = 1889425944. Its totient is φ = 262144000.

The previous prime is 720900391. The next prime is 720900403. The reversal of 720900400 is 4009027.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is not an unprimeable number, because it can be changed into a prime (720900403) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 77521 + ... + 86320.

Almost surely, 2^720900400 is an apocalyptic number.

It is an amenable number.

720900400 is an abundant number, since it is smaller than the sum of its proper divisors (1168525544).

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

720900400 is a wasteful number, since it uses less digits than its factorization.

720900400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 163870 (or 163859 counting only the distinct ones).

The product of its (nonzero) digits is 504, while the sum is 22.

The square root of 720900400 is about 26849.5884512221. The cubic root of 720900400 is about 896.6544100504.

Adding to 720900400 its reverse (4009027), we get a palindrome (724909427).

The spelling of 720900400 in words is "seven hundred twenty million, nine hundred thousand, four hundred".