820478719 has 2 divisors, whose sum is σ = 820478720. Its totient is φ = 820478718.

The previous prime is 820478707. The next prime is 820478749. The reversal of 820478719 is 917874028.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-820478719 is a prime.

It is a super-2 number, since 2×820478719² = 1346370656663761922, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (820478749) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 410239359 + 410239360.

It is an arithmetic number, because the mean of its divisors is an integer number (410239360).

Almost surely, 2^820478719 is an apocalyptic number.

820478719 is a deficient number, since it is larger than the sum of its proper divisors (1).

820478719 is an equidigital number, since it uses as much as digits as its factorization.

820478719 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 225792, while the sum is 46.

The square root of 820478719 is about 28643.9997032537. Note that the first 3 decimals coincide. The cubic root of 820478719 is about 936.1722717070.

The spelling of 820478719 in words is "eight hundred twenty million, four hundred seventy-eight thousand, seven hundred nineteen".