820287081 has 12 divisors (see below), whose sum is σ = 1228743152. Its totient is φ = 546857892.

The previous prime is 820287079. The next prime is 820287107. The reversal of 820287081 is 180782028.

It is not a de Polignac number, because 820287081 - 2¹ = 820287079 is a prime.

It is a super-2 number, since 2×820287081² = 1345741790511001122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (820287071) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1687591 + ... + 1688076.

Almost surely, 2^820287081 is an apocalyptic number.

820287081 is a gapful number since it is divisible by the number (81) formed by its first and last digit.

It is an amenable number.

820287081 is a deficient number, since it is larger than the sum of its proper divisors (408456071).

820287081 is an equidigital number, since it uses as much as digits as its factorization.

820287081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3375682 (or 3375670 counting only the distinct ones).

The product of its (nonzero) digits is 14336, while the sum is 36.

The square root of 820287081 is about 28640.6543395922. The cubic root of 820287081 is about 936.0993792410.

The spelling of 820287081 in words is "eight hundred twenty million, two hundred eighty-seven thousand, eighty-one".