649687 has 8 divisors (see below), whose sum is σ = 689040. Its totient is φ = 611520.

The previous prime is 649661. The next prime is 649697. The reversal of 649687 is 786946.

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

It is a cyclic number.

It is not a de Polignac number, because 649687 - 2⁷ = 649559 is a prime.

It is a nialpdrome in base 15.

It is a zygodrome in base 15.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (649657) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 987 + ... + 1507.

It is an arithmetic number, because the mean of its divisors is an integer number (86130).

2⁶⁴⁹⁶⁸⁷ is an apocalyptic number.

649687 is a deficient number, since it is larger than the sum of its proper divisors (39353).

649687 is a wasteful number, since it uses less digits than its factorization.

649687 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 593.

The product of its digits is 72576, while the sum is 40.

The square root of 649687 is about 806.0316370962. The cubic root of 649687 is about 86.6100040535.

The spelling of 649687 in words is "six hundred forty-nine thousand, six hundred eighty-seven".