649760505 has 8 divisors (see below), whose sum is σ = 1039616832. Its totient is φ = 346538928.

The previous prime is 649760491. The next prime is 649760521. The reversal of 649760505 is 505067946.

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

It is not a de Polignac number, because 649760505 - 2¹¹ = 649758457 is a prime.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Curzon 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, 21658669 + ... + 21658698.

It is an arithmetic number, because the mean of its divisors is an integer number (129952104).

Almost surely, 2^649760505 is an apocalyptic number.

It is an amenable number.

649760505 is a deficient number, since it is larger than the sum of its proper divisors (389856327).

649760505 is a wasteful number, since it uses less digits than its factorization.

649760505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43317375.

The product of its (nonzero) digits is 226800, while the sum is 42.

The square root of 649760505 is about 25490.4002518595. The cubic root of 649760505 is about 866.1327025616.

The spelling of 649760505 in words is "six hundred forty-nine million, seven hundred sixty thousand, five hundred five".