8055721 has 8 divisors (see below), whose sum is σ = 8390088. Its totient is φ = 7728000.

The previous prime is 8055713. The next prime is 8055779. The reversal of 8055721 is 1275508.

It can be written as a sum of positive squares in 4 ways, for example, as 18496 + 8037225 = 136^2 + 2835^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 8055721 - 2³ = 8055713 is a prime.

It is a Duffinian number.

8055721 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 8055721.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8055701) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 891 + ... + 4111.

It is an arithmetic number, because the mean of its divisors is an integer number (1048761).

Almost surely, 2^8055721 is an apocalyptic number.

It is an amenable number.

8055721 is a deficient number, since it is larger than the sum of its proper divisors (334367).

8055721 is a wasteful number, since it uses less digits than its factorization.

8055721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3323.

The product of its (nonzero) digits is 2800, while the sum is 28.

The square root of 8055721 is about 2838.2602065350. The cubic root of 8055721 is about 200.4632677531.

The spelling of 8055721 in words is "eight million, fifty-five thousand, seven hundred twenty-one".