649478 has 8 divisors (see below), whose sum is σ = 982272. Its totient is φ = 322056.

The previous prime is 649471. The next prime is 649483. The reversal of 649478 is 874946.

It is a happy number.

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

It is a zygodrome in base 9.

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 649478.

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

649478 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1025 + ... + 1532.

It is an arithmetic number, because the mean of its divisors is an integer number (122784).

2⁶⁴⁹⁴⁷⁸ is an apocalyptic number.

649478 is a deficient number, since it is larger than the sum of its proper divisors (332794).

649478 is a wasteful number, since it uses less digits than its factorization.

649478 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2686.

The product of its digits is 48384, while the sum is 38.

The square root of 649478 is about 805.9019791513. The cubic root of 649478 is about 86.6007157694.

The spelling of 649478 in words is "six hundred forty-nine thousand, four hundred seventy-eight".