649686369 has 16 divisors (see below), whose sum is σ = 889225344. Its totient is φ = 421680000.

The previous prime is 649686343. The next prime is 649686371. The reversal of 649686369 is 963686946.

It is not a de Polignac number, because 649686369 - 2⁷ = 649686241 is a prime.

It is a super-2 number, since 2×649686369² = 844184756128808322, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (649686319) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 56619 + ... + 67119.

It is an arithmetic number, because the mean of its divisors is an integer number (55576584).

Almost surely, 2^649686369 is an apocalyptic number.

It is an amenable number.

649686369 is a deficient number, since it is larger than the sum of its proper divisors (239538975).

649686369 is a wasteful number, since it uses less digits than its factorization.

649686369 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11048.

The product of its digits is 10077696, while the sum is 57.

The square root of 649686369 is about 25488.9460158713. The cubic root of 649686369 is about 866.0997601386.

The spelling of 649686369 in words is "six hundred forty-nine million, six hundred eighty-six thousand, three hundred sixty-nine".