6449778 has 24 divisors (see below), whose sum is σ = 14710800. Its totient is φ = 2036664.

The previous prime is 6449777. The next prime is 6449791. The reversal of 6449778 is 8779446.

It is not an unprimeable number, because it can be changed into a prime (6449777) 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, 9088 + ... + 9771.

It is an arithmetic number, because the mean of its divisors is an integer number (612950).

Almost surely, 2^6449778 is an apocalyptic number.

6449778 is an abundant number, since it is smaller than the sum of its proper divisors (8261022).

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

6449778 is a wasteful number, since it uses less digits than its factorization.

6449778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18886 (or 18883 counting only the distinct ones).

The product of its digits is 338688, while the sum is 45.

The square root of 6449778 is about 2539.6413132567. The cubic root of 6449778 is about 186.1436628557.

It can be divided in two parts, 6449 and 778, that added together give a palindrome (7227).

The spelling of 6449778 in words is "six million, four hundred forty-nine thousand, seven hundred seventy-eight".