80778890 has 32 divisors (see below), whose sum is σ = 149170896. Its totient is φ = 31482880.

The previous prime is 80778889. The next prime is 80778959. The reversal of 80778890 is 9887708.

It can be written as a sum of positive squares in 8 ways, for example, as 48958009 + 31820881 = 6997^2 + 5641^2 .

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 in 15 ways as a sum of consecutive naturals, for example, 91250 + ... + 92130.

Almost surely, 2^80778890 is an apocalyptic number.

80778890 is a deficient number, since it is larger than the sum of its proper divisors (68392006).

80778890 is a wasteful number, since it uses less digits than its factorization.

80778890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1114.

The product of its (nonzero) digits is 225792, while the sum is 47.

The square root of 80778890 is about 8987.7077166539. The cubic root of 80778890 is about 432.2808137931.

It can be divided in two parts, 807 and 78890, that added together give a palindrome (79697).

The spelling of 80778890 in words is "eighty million, seven hundred seventy-eight thousand, eight hundred ninety".