649278 has 24 divisors (see below), whose sum is σ = 1608048. Its totient is φ = 185472.

The previous prime is 649277. The next prime is 649279. The reversal of 649278 is 872946.

649278 is a `hidden beast` number, since 649 + 2 + 7 + 8 = 666.

It is an interprime number because it is at equal distance from previous prime (649277) and next prime (649279).

It is an Ulam number.

It is a d-powerful number, because it can be written as 6² + 4² + 2⁷ + 9⁶ + 7⁶ + 8 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (649273) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2451 + ... + 2702.

It is an arithmetic number, because the mean of its divisors is an integer number (67002).

2⁶⁴⁹²⁷⁸ is an apocalyptic number.

649278 is an abundant number, since it is smaller than the sum of its proper divisors (958770).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

649278 is a wasteful number, since it uses less digits than its factorization.

649278 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5168 (or 5165 counting only the distinct ones).

The product of its digits is 24192, while the sum is 36.

The square root of 649278 is about 805.7778850279. Note that the first 3 decimals coincide. The cubic root of 649278 is about 86.5918255933.

It can be divided in two parts, 6 and 49278, that added together give a square (49284 = 222²).

The spelling of 649278 in words is "six hundred forty-nine thousand, two hundred seventy-eight".