80778886 has 4 divisors (see below), whose sum is σ = 121168332. Its totient is φ = 40389442.

The previous prime is 80778871. The next prime is 80778889. The reversal of 80778886 is 68887708.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (80778889) 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 as a sum of consecutive naturals, namely, 20194720 + ... + 20194723.

It is an arithmetic number, because the mean of its divisors is an integer number (30292083).

Almost surely, 2^80778886 is an apocalyptic number.

80778886 is a deficient number, since it is larger than the sum of its proper divisors (40389446).

80778886 is a wasteful number, since it uses less digits than its factorization.

80778886 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40389445.

The product of its (nonzero) digits is 1204224, while the sum is 52.

The square root of 80778886 is about 8987.7074941277. The cubic root of 80778886 is about 432.2808066579.

The spelling of 80778886 in words is "eighty million, seven hundred seventy-eight thousand, eight hundred eighty-six".