720609906 has 32 divisors (see below), whose sum is σ = 1528148160. Its totient is φ = 225755136.

The previous prime is 720609899. The next prime is 720609907. The reversal of 720609906 is 609906027.

It is not an unprimeable number, because it can be changed into a prime (720609907) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 73845 + ... + 83031.

It is an arithmetic number, because the mean of its divisors is an integer number (47754630).

Almost surely, 2^720609906 is an apocalyptic number.

720609906 is an abundant number, since it is smaller than the sum of its proper divisors (807538254).

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

720609906 is a wasteful number, since it uses less digits than its factorization.

720609906 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9978.

The product of its (nonzero) digits is 40824, while the sum is 39.

The square root of 720609906 is about 26844.1782515316. The cubic root of 720609906 is about 896.5339552595.

The spelling of 720609906 in words is "seven hundred twenty million, six hundred nine thousand, nine hundred six".