6421078 has 8 divisors (see below), whose sum is σ = 9657072. Its totient is φ = 3202056.

The previous prime is 6421073. The next prime is 6421099. The reversal of 6421078 is 8701246.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6421073) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3250 + ... + 4837.

It is an arithmetic number, because the mean of its divisors is an integer number (1207134).

Almost surely, 2^6421078 is an apocalyptic number.

6421078 is a deficient number, since it is larger than the sum of its proper divisors (3235994).

6421078 is a wasteful number, since it uses less digits than its factorization.

6421078 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8486.

The product of its (nonzero) digits is 2688, while the sum is 28.

The square root of 6421078 is about 2533.9846092666. The cubic root of 6421078 is about 185.8671537624.

It can be divided in two parts, 642 and 1078, that multiplied together give a triangular number (692076 = T₁₁₇₆).

The spelling of 6421078 in words is "six million, four hundred twenty-one thousand, seventy-eight".