820614647 has 2 divisors, whose sum is σ = 820614648. Its totient is φ = 820614646.

The previous prime is 820614629. The next prime is 820614673. The reversal of 820614647 is 746416028.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 820614647 - 2⁸ = 820614391 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 820614647.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (820614607) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 410307323 + 410307324.

It is an arithmetic number, because the mean of its divisors is an integer number (410307324).

Almost surely, 2^820614647 is an apocalyptic number.

820614647 is a deficient number, since it is larger than the sum of its proper divisors (1).

820614647 is an equidigital number, since it uses as much as digits as its factorization.

820614647 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 64512, while the sum is 38.

The square root of 820614647 is about 28646.3723183233. The cubic root of 820614647 is about 936.2239671360.

The spelling of 820614647 in words is "eight hundred twenty million, six hundred fourteen thousand, six hundred forty-seven".