649677 has 8 divisors (see below), whose sum is σ = 990016. Its totient is φ = 371232.

The previous prime is 649661. The next prime is 649697. The reversal of 649677 is 776946.

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

It is not a de Polignac number, because 649677 - 2⁴ = 649661 is a prime.

It is a Duffinian number.

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 polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15448 + ... + 15489.

It is an arithmetic number, because the mean of its divisors is an integer number (123752).

2⁶⁴⁹⁶⁷⁷ is an apocalyptic number.

It is an amenable number.

649677 is a deficient number, since it is larger than the sum of its proper divisors (340339).

649677 is a wasteful number, since it uses less digits than its factorization.

649677 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30947.

The product of its digits is 63504, while the sum is 39.

The square root of 649677 is about 806.0254338419. The cubic root of 649677 is about 86.6095596834.

It can be divided in two parts, 649 and 677, that added together give a triangular number (1326 = T₅₁).

The spelling of 649677 in words is "six hundred forty-nine thousand, six hundred seventy-seven".