80905756 has 12 divisors (see below), whose sum is σ = 143985240. Its totient is φ = 39767120.

The previous prime is 80905723. The next prime is 80905757. The reversal of 80905756 is 65750908.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (80905757) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 171175 + ... + 171646.

It is an arithmetic number, because the mean of its divisors is an integer number (11998770).

Almost surely, 2^80905756 is an apocalyptic number.

It is an amenable number.

80905756 is a deficient number, since it is larger than the sum of its proper divisors (63079484).

80905756 is a wasteful number, since it uses less digits than its factorization.

80905756 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 342884 (or 342882 counting only the distinct ones).

The product of its (nonzero) digits is 75600, while the sum is 40.

The square root of 80905756 is about 8994.7626983706. The cubic root of 80905756 is about 432.5069993410.

The spelling of 80905756 in words is "eighty million, nine hundred five thousand, seven hundred fifty-six".