720585394 has 8 divisors (see below), whose sum is σ = 1081948140. Its totient is φ = 359936016.

The previous prime is 720585391. The next prime is 720585407. The reversal of 720585394 is 493585027.

720585394 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 709529769 + 11055625 = 26637^2 + 3325^2 .

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

It is a super-2 number, since 2×720585394² = 1038486620092270472, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 720585394.

It is not an unprimeable number, because it can be changed into a prime (720585391) 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, 175809 + ... + 179860.

Almost surely, 2^720585394 is an apocalyptic number.

720585394 is a deficient number, since it is larger than the sum of its proper divisors (361362746).

720585394 is a wasteful number, since it uses less digits than its factorization.

720585394 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 356684.

The product of its (nonzero) digits is 302400, while the sum is 43.

The square root of 720585394 is about 26843.7216868302. The cubic root of 720585394 is about 896.5237897551.

The spelling of 720585394 in words is "seven hundred twenty million, five hundred eighty-five thousand, three hundred ninety-four".