80978911 has 8 divisors (see below), whose sum is σ = 87307920. Its totient is φ = 74664192.

The previous prime is 80978879. The next prime is 80978921. The reversal of 80978911 is 11987908.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 80978911 - 2⁵ = 80978879 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (80978921) 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 7 ways as a sum of consecutive naturals, for example, 10191 + ... + 16303.

It is an arithmetic number, because the mean of its divisors is an integer number (10913490).

Almost surely, 2^80978911 is an apocalyptic number.

80978911 is a deficient number, since it is larger than the sum of its proper divisors (6329009).

80978911 is a wasteful number, since it uses less digits than its factorization.

80978911 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7145.

The product of its (nonzero) digits is 36288, while the sum is 43.

The square root of 80978911 is about 8998.8283126194. The cubic root of 80978911 is about 432.6373177080.

The spelling of 80978911 in words is "eighty million, nine hundred seventy-eight thousand, nine hundred eleven".