6409778 has 8 divisors (see below), whose sum is σ = 10032768. Its totient is φ = 3065524.

The previous prime is 6409757. The next prime is 6409807. The reversal of 6409778 is 8779046.

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

It is an Ulam 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 3 ways as a sum of consecutive naturals, for example, 69626 + ... + 69717.

It is an arithmetic number, because the mean of its divisors is an integer number (1254096).

Almost surely, 2^6409778 is an apocalyptic number.

6409778 is a deficient number, since it is larger than the sum of its proper divisors (3622990).

6409778 is a wasteful number, since it uses less digits than its factorization.

6409778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 139368.

The product of its (nonzero) digits is 84672, while the sum is 41.

The square root of 6409778 is about 2531.7539374908. The cubic root of 6409778 is about 185.7580582648.

The spelling of 6409778 in words is "six million, four hundred nine thousand, seven hundred seventy-eight".