80540865 has 16 divisors (see below), whose sum is σ = 143184000. Its totient is φ = 42955056.

The previous prime is 80540819. The next prime is 80540879. The reversal of 80540865 is 56804508.

It is a happy number.

It is not a de Polignac number, because 80540865 - 2¹¹ = 80538817 is a prime.

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, 298165 + ... + 298434.

It is an arithmetic number, because the mean of its divisors is an integer number (8949000).

Almost surely, 2^80540865 is an apocalyptic number.

It is an amenable number.

80540865 is a deficient number, since it is larger than the sum of its proper divisors (62643135).

80540865 is a wasteful number, since it uses less digits than its factorization.

80540865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 596613 (or 596607 counting only the distinct ones).

The product of its (nonzero) digits is 38400, while the sum is 36.

The square root of 80540865 is about 8974.4562509380. The cubic root of 80540865 is about 431.8558064287.

It can be divided in two parts, 8054086 and 5, that added together give a triangular number (8054091 = T₄₀₁₃).

The spelling of 80540865 in words is "eighty million, five hundred forty thousand, eight hundred sixty-five".