649475 has 12 divisors (see below), whose sum is σ = 817656. Its totient is φ = 511680.

The previous prime is 649471. The next prime is 649483. The reversal of 649475 is 574946.

It is not a de Polignac number, because 649475 - 2² = 649471 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 649475.

It is not an unprimeable number, because it can be changed into a prime (649471) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1919 + ... + 2231.

It is an arithmetic number, because the mean of its divisors is an integer number (68138).

649475 is a Friedman number, since it can be written as 9^5*(7+4)-64, using all its digits and the basic arithmetic operations.

2⁶⁴⁹⁴⁷⁵ is an apocalyptic number.

649475 is a deficient number, since it is larger than the sum of its proper divisors (168181).

649475 is a wasteful number, since it uses less digits than its factorization.

649475 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 406 (or 401 counting only the distinct ones).

The product of its digits is 30240, while the sum is 35.

The square root of 649475 is about 805.9001178806. The cubic root of 649475 is about 86.6005824303.

Subtracting from 649475 its reverse (574946), we obtain a square (74529 = 273²).

The spelling of 649475 in words is "six hundred forty-nine thousand, four hundred seventy-five".