820678583 has 2 divisors, whose sum is σ = 820678584. Its totient is φ = 820678582.

The previous prime is 820678577. The next prime is 820678633. The reversal of 820678583 is 385876028.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-820678583 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (820678543) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 410339291 + 410339292.

It is an arithmetic number, because the mean of its divisors is an integer number (410339292).

Almost surely, 2^820678583 is an apocalyptic number.

820678583 is a deficient number, since it is larger than the sum of its proper divisors (1).

820678583 is an equidigital number, since it uses as much as digits as its factorization.

820678583 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 645120, while the sum is 47.

The square root of 820678583 is about 28647.4882494085. The cubic root of 820678583 is about 936.2482809684.

The spelling of 820678583 in words is "eight hundred twenty million, six hundred seventy-eight thousand, five hundred eighty-three".