820064723 has 2 divisors, whose sum is σ = 820064724. Its totient is φ = 820064722.

The previous prime is 820064677. The next prime is 820064737. The reversal of 820064723 is 327460028.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 820064723 - 2¹² = 820060627 is a prime.

It is a super-2 number, since 2×820064723² = 1345012299818133458, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 820064723.

It is not a weakly prime, because it can be changed into another prime (820064743) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 410032361 + 410032362.

It is an arithmetic number, because the mean of its divisors is an integer number (410032362).

Almost surely, 2^820064723 is an apocalyptic number.

820064723 is a deficient number, since it is larger than the sum of its proper divisors (1).

820064723 is an equidigital number, since it uses as much as digits as its factorization.

820064723 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 16128, while the sum is 32.

The square root of 820064723 is about 28636.7722168543. The cubic root of 820064723 is about 936.0147877196.

The spelling of 820064723 in words is "eight hundred twenty million, sixty-four thousand, seven hundred twenty-three".