8720819 has 2 divisors, whose sum is σ = 8720820. Its totient is φ = 8720818.

The previous prime is 8720809. The next prime is 8720837. The reversal of 8720819 is 9180278.

It is a happy number.

8720819 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-8720819 is a prime.

It is a super-2 number, since 2×8720819² = 152105368061522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (8720809) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4360409 + 4360410.

It is an arithmetic number, because the mean of its divisors is an integer number (4360410).

Almost surely, 2^8720819 is an apocalyptic number.

8720819 is a deficient number, since it is larger than the sum of its proper divisors (1).

8720819 is an equidigital number, since it uses as much as digits as its factorization.

8720819 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8064, while the sum is 35.

The square root of 8720819 is about 2953.1032829889. The cubic root of 8720819 is about 205.8349370551.

The spelling of 8720819 in words is "eight million, seven hundred twenty thousand, eight hundred nineteen".