6449780 has 24 divisors (see below), whose sum is σ = 13621608. Its totient is φ = 2565248.

The previous prime is 6449777. The next prime is 6449791. The reversal of 6449780 is 879446.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 708964 + 5740816 = 842^2 + 2396^2 .

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 3122 + ... + 4758.

It is an arithmetic number, because the mean of its divisors is an integer number (567567).

Almost surely, 2^6449780 is an apocalyptic number.

It is an amenable number.

6449780 is an abundant number, since it is smaller than the sum of its proper divisors (7171828).

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

6449780 is a wasteful number, since it uses less digits than its factorization.

6449780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1843 (or 1841 counting only the distinct ones).

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

The square root of 6449780 is about 2539.6417070130. The cubic root of 6449780 is about 186.1436820960.

The spelling of 6449780 in words is "six million, four hundred forty-nine thousand, seven hundred eighty".