6721478 has 16 divisors (see below), whose sum is σ = 10752000. Its totient is φ = 3142152.

The previous prime is 6721469. The next prime is 6721483. The reversal of 6721478 is 8741276.

6721478 = T₃₈₂ + T₃₈₃ + ... + T₄₅₇.

It is a happy number.

It is an alternating number because its digits alternate between even and odd.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 1883 + ... + 4121.

It is an arithmetic number, because the mean of its divisors is an integer number (672000).

Almost surely, 2^6721478 is an apocalyptic number.

6721478 is a deficient number, since it is larger than the sum of its proper divisors (4030522).

6721478 is a wasteful number, since it uses less digits than its factorization.

6721478 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2339.

The product of its digits is 18816, while the sum is 35.

The square root of 6721478 is about 2592.5813391290. The cubic root of 6721478 is about 188.7215930233.

The spelling of 6721478 in words is "six million, seven hundred twenty-one thousand, four hundred seventy-eight".