6721370 has 8 divisors (see below), whose sum is σ = 12098484. Its totient is φ = 2688544.

The previous prime is 6721367. The next prime is 6721381. The reversal of 6721370 is 731276.

It can be written as a sum of positive squares in 2 ways, for example, as 5707321 + 1014049 = 2389^2 + 1007^2 .

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 (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 336059 + ... + 336078.

Almost surely, 2^6721370 is an apocalyptic number.

6721370 is a deficient number, since it is larger than the sum of its proper divisors (5377114).

6721370 is a wasteful number, since it uses less digits than its factorization.

6721370 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 672144.

The product of its (nonzero) digits is 1764, while the sum is 26.

The square root of 6721370 is about 2592.5605103835. The cubic root of 6721370 is about 188.7205822317.

The spelling of 6721370 in words is "six million, seven hundred twenty-one thousand, three hundred seventy".