649728605 has 8 divisors (see below), whose sum is σ = 779933664. Its totient is φ = 519610000.

The previous prime is 649728539. The next prime is 649728637. The reversal of 649728605 is 506827946.

649728605 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 649728605 - 2¹⁴ = 649712221 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 649728605.

It is a congruent number.

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, 3731 + ... + 36240.

It is an arithmetic number, because the mean of its divisors is an integer number (97491708).

Almost surely, 2^649728605 is an apocalyptic number.

It is an amenable number.

649728605 is a deficient number, since it is larger than the sum of its proper divisors (130205059).

649728605 is a wasteful number, since it uses less digits than its factorization.

649728605 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43227.

The product of its (nonzero) digits is 725760, while the sum is 47.

The square root of 649728605 is about 25489.7745184221. The cubic root of 649728605 is about 866.1185280644.

The spelling of 649728605 in words is "six hundred forty-nine million, seven hundred twenty-eight thousand, six hundred five".