649678 has 4 divisors (see below), whose sum is σ = 974520. Its totient is φ = 324838.

The previous prime is 649661. The next prime is 649697. The reversal of 649678 is 876946.

It is a semiprime because it is the product of two primes.

It is a d-powerful number, because it can be written as 6 + 4³ + 6 + 9⁶ + 7⁶ + 8³ .

It is a self number, because there is not a number n which added to its sum of digits gives 649678.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 162418 + ... + 162421.

It is an arithmetic number, because the mean of its divisors is an integer number (243630).

2⁶⁴⁹⁶⁷⁸ is an apocalyptic number.

649678 is a deficient number, since it is larger than the sum of its proper divisors (324842).

649678 is a wasteful number, since it uses less digits than its factorization.

649678 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 324841.

The product of its digits is 72576, while the sum is 40.

The square root of 649678 is about 806.0260541695. The cubic root of 649678 is about 86.6096041206.

The spelling of 649678 in words is "six hundred forty-nine thousand, six hundred seventy-eight".