721200080 has 20 divisors (see below), whose sum is σ = 1676790372. Its totient is φ = 288480000.

The previous prime is 721200071. The next prime is 721200091. The reversal of 721200080 is 80002127.

It can be written as a sum of positive squares in 2 ways, for example, as 422878096 + 298321984 = 20564^2 + 17272^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4507421 + ... + 4507580.

Almost surely, 2^721200080 is an apocalyptic number.

It is an amenable number.

721200080 is an abundant number, since it is smaller than the sum of its proper divisors (955590292).

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

721200080 is a wasteful number, since it uses less digits than its factorization.

721200080 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9015014 (or 9015008 counting only the distinct ones).

The product of its (nonzero) digits is 224, while the sum is 20.

The square root of 721200080 is about 26855.1685900498. The cubic root of 721200080 is about 896.7786399569.

The spelling of 721200080 in words is "seven hundred twenty-one million, two hundred thousand, eighty".