720578506 has 8 divisors (see below), whose sum is σ = 1082158560. Its totient is φ = 359858988.

The previous prime is 720578483. The next prime is 720578533. The reversal of 720578506 is 605875027.

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 213036 + ... + 216391.

It is an arithmetic number, because the mean of its divisors is an integer number (135269820).

Almost surely, 2^720578506 is an apocalyptic number.

720578506 is a deficient number, since it is larger than the sum of its proper divisors (361580054).

720578506 is a wasteful number, since it uses less digits than its factorization.

720578506 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 430268.

The product of its (nonzero) digits is 117600, while the sum is 40.

The square root of 720578506 is about 26843.5933883674. The cubic root of 720578506 is about 896.5209331538.

The spelling of 720578506 in words is "seven hundred twenty million, five hundred seventy-eight thousand, five hundred six".