8077821 has 8 divisors (see below), whose sum is σ = 10783680. Its totient is φ = 5378592.

The previous prime is 8077799. The next prime is 8077847. The reversal of 8077821 is 1287708.

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

It is not a de Polignac number, because 8077821 - 2⁵ = 8077789 is a prime.

8077821 is a lucky number.

It is a nialpdrome in base 15.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8077871) 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, 3360 + ... + 5238.

It is an arithmetic number, because the mean of its divisors is an integer number (1347960).

Almost surely, 2^8077821 is an apocalyptic number.

It is an amenable number.

8077821 is a deficient number, since it is larger than the sum of its proper divisors (2705859).

8077821 is a wasteful number, since it uses less digits than its factorization.

8077821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3315.

The product of its (nonzero) digits is 6272, while the sum is 33.

The square root of 8077821 is about 2842.1507701035. The cubic root of 8077821 is about 200.6464168090.

The spelling of 8077821 in words is "eight million, seventy-seven thousand, eight hundred twenty-one".