649775 has 24 divisors (see below), whose sum is σ = 952320. Its totient is φ = 430560.

The previous prime is 649771. The next prime is 649777. The reversal of 649775 is 577946.

It is not a de Polignac number, because 649775 - 2² = 649771 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (649771) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 8186 + ... + 8264.

It is an arithmetic number, because the mean of its divisors is an integer number (39680).

2⁶⁴⁹⁷⁷⁵ is an apocalyptic number.

649775 is a deficient number, since it is larger than the sum of its proper divisors (302545).

649775 is a wasteful number, since it uses less digits than its factorization.

649775 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 143 (or 138 counting only the distinct ones).

The product of its digits is 52920, while the sum is 38.

The square root of 649775 is about 806.0862236759. The cubic root of 649775 is about 86.6139143140.

The spelling of 649775 in words is "six hundred forty-nine thousand, seven hundred seventy-five".