720405580 has 12 divisors (see below), whose sum is σ = 1512851760. Its totient is φ = 288162224.

The previous prime is 720405571. The next prime is 720405589. The reversal of 720405580 is 85504027.

It is an interprime number because it is at equal distance from previous prime (720405571) and next prime (720405589).

It is a super-3 number, since 3×720405580³ (a number of 28 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (720405589) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18010120 + ... + 18010159.

It is an arithmetic number, because the mean of its divisors is an integer number (126070980).

Almost surely, 2^720405580 is an apocalyptic number.

It is an amenable number.

720405580 is an abundant number, since it is smaller than the sum of its proper divisors (792446180).

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

720405580 is a wasteful number, since it uses less digits than its factorization.

720405580 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36020288 (or 36020286 counting only the distinct ones).

The product of its (nonzero) digits is 11200, while the sum is 31.

The square root of 720405580 is about 26840.3722030824. The cubic root of 720405580 is about 896.4492110672.

The spelling of 720405580 in words is "seven hundred twenty million, four hundred five thousand, five hundred eighty".