649647 has 8 divisors (see below), whose sum is σ = 962480. Its totient is φ = 433080.

The previous prime is 649643. The next prime is 649651. The reversal of 649647 is 746946.

649647 is a `hidden beast` number, since 6 + 4 + 9 + 647 = 666.

It is an interprime number because it is at equal distance from previous prime (649643) and next prime (649651).

It is not a de Polignac number, because 649647 - 2² = 649643 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (649643) 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, 12004 + ... + 12057.

It is an arithmetic number, because the mean of its divisors is an integer number (120310).

2⁶⁴⁹⁶⁴⁷ is an apocalyptic number.

649647 is a deficient number, since it is larger than the sum of its proper divisors (312833).

649647 is a wasteful number, since it uses less digits than its factorization.

649647 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24070 (or 24064 counting only the distinct ones).

The product of its digits is 36288, while the sum is 36.

The square root of 649647 is about 806.0068237925. The cubic root of 649647 is about 86.6082265456.

It can be divided in two parts, 649 and 647, that added together give a 4-th power (1296 = 6⁴).

The spelling of 649647 in words is "six hundred forty-nine thousand, six hundred forty-seven".