80815845 has 16 divisors (see below), whose sum is σ = 141060672. Its totient is φ = 39183360.

The previous prime is 80815829. The next prime is 80815883. The reversal of 80815845 is 54851808.

It is not a de Polignac number, because 80815845 - 2⁴ = 80815829 is a prime.

It is a congruent 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 15 ways as a sum of consecutive naturals, for example, 244732 + ... + 245061.

It is an arithmetic number, because the mean of its divisors is an integer number (8816292).

Almost surely, 2^80815845 is an apocalyptic number.

It is an amenable number.

80815845 is a deficient number, since it is larger than the sum of its proper divisors (60244827).

80815845 is a wasteful number, since it uses less digits than its factorization.

80815845 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 489812.

The product of its (nonzero) digits is 51200, while the sum is 39.

The square root of 80815845 is about 8989.7633450497. The cubic root of 80815845 is about 432.3467241731.

It can be divided in two parts, 808 and 15845, that added together give a triangular number (16653 = T₁₈₂).

The spelling of 80815845 in words is "eighty million, eight hundred fifteen thousand, eight hundred forty-five".