720540506 has 16 divisors (see below), whose sum is σ = 1235601216. Its totient is φ = 308705856.

The previous prime is 720540493. The next prime is 720540511. The reversal of 720540506 is 605045027.

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, 54785 + ... + 66651.

It is an arithmetic number, because the mean of its divisors is an integer number (77225076).

Almost surely, 2^720540506 is an apocalyptic number.

720540506 is a deficient number, since it is larger than the sum of its proper divisors (515060710).

720540506 is a wasteful number, since it uses less digits than its factorization.

720540506 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16213.

The product of its (nonzero) digits is 8400, while the sum is 29.

The square root of 720540506 is about 26842.8855751389. The cubic root of 720540506 is about 896.5051734117.

The spelling of 720540506 in words is "seven hundred twenty million, five hundred forty thousand, five hundred six".