80905556 has 6 divisors (see below), whose sum is σ = 141584730. Its totient is φ = 40452776.

The previous prime is 80905537. The next prime is 80905571. The reversal of 80905556 is 65550908.

It can be written as a sum of positive squares in only one way, i.e., 76562500 + 4343056 = 8750^2 + 2084^2 .

It is a congruent number.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 10113191 + ... + 10113198.

It is an arithmetic number, because the mean of its divisors is an integer number (23597455).

Almost surely, 2^80905556 is an apocalyptic number.

It is an amenable number.

80905556 is a deficient number, since it is larger than the sum of its proper divisors (60679174).

80905556 is a wasteful number, since it uses less digits than its factorization.

80905556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20226393 (or 20226391 counting only the distinct ones).

The product of its (nonzero) digits is 54000, while the sum is 38.

The square root of 80905556 is about 8994.7515807831. The cubic root of 80905556 is about 432.5066429532.

The spelling of 80905556 in words is "eighty million, nine hundred five thousand, five hundred fifty-six".