720640235 has 8 divisors (see below), whose sum is σ = 988306656. Its totient is φ = 494153280.

The previous prime is 720640213. The next prime is 720640243. The reversal of 720640235 is 532046027.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 720640235 - 2¹⁰ = 720639211 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 720640198 and 720640207.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10294826 + ... + 10294895.

It is an arithmetic number, because the mean of its divisors is an integer number (123538332).

Almost surely, 2^720640235 is an apocalyptic number.

720640235 is a deficient number, since it is larger than the sum of its proper divisors (267666421).

720640235 is a wasteful number, since it uses less digits than its factorization.

720640235 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20589733.

The product of its (nonzero) digits is 10080, while the sum is 29.

The square root of 720640235 is about 26844.7431539212. The cubic root of 720640235 is about 896.5465328444.

The spelling of 720640235 in words is "seven hundred twenty million, six hundred forty thousand, two hundred thirty-five".