80640885 has 32 divisors (see below), whose sum is σ = 139829760. Its totient is φ = 39683904.

The previous prime is 80640881. The next prime is 80640893. The reversal of 80640885 is 58804608.

It is not a de Polignac number, because 80640885 - 2² = 80640881 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (80640881) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 31732 + ... + 34178.

It is an arithmetic number, because the mean of its divisors is an integer number (4369680).

Almost surely, 2^80640885 is an apocalyptic number.

It is an amenable number.

80640885 is a deficient number, since it is larger than the sum of its proper divisors (59188875).

80640885 is a wasteful number, since it uses less digits than its factorization.

80640885 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2494 (or 2468 counting only the distinct ones).

The product of its (nonzero) digits is 61440, while the sum is 39.

The square root of 80640885 is about 8980.0270044137. The cubic root of 80640885 is about 432.0344997739.

The spelling of 80640885 in words is "eighty million, six hundred forty thousand, eight hundred eighty-five".