80646385 has 32 divisors (see below), whose sum is σ = 106741152. Its totient is φ = 58245120.

The previous prime is 80646373. The next prime is 80646403. The reversal of 80646385 is 58364608.

It can be written as a sum of positive squares in 16 ways, for example, as 44502241 + 36144144 = 6671^2 + 6012^2 .

It is not a de Polignac number, because 80646385 - 2²³ = 72257777 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 254247 + ... + 254563.

It is an arithmetic number, because the mean of its divisors is an integer number (3335661).

Almost surely, 2^80646385 is an apocalyptic number.

80646385 is a gapful number since it is divisible by the number (85) formed by its first and last digit.

It is an amenable number.

80646385 is a deficient number, since it is larger than the sum of its proper divisors (26094767).

80646385 is a wasteful number, since it uses less digits than its factorization.

80646385 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 453.

The product of its (nonzero) digits is 138240, while the sum is 40.

The square root of 80646385 is about 8980.3332343516. Note that the first 3 decimals coincide. The cubic root of 80646385 is about 432.0443216557.

The spelling of 80646385 in words is "eighty million, six hundred forty-six thousand, three hundred eighty-five".