80581378 has 4 divisors (see below), whose sum is σ = 120872070. Its totient is φ = 40290688.

The previous prime is 80581367. The next prime is 80581387. The reversal of 80581378 is 87318508.

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

It can be written as a sum of positive squares in only one way, i.e., 65658609 + 14922769 = 8103^2 + 3863^2 .

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a self number, because there is not a number n which added to its sum of digits gives 80581378.

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, 20145343 + ... + 20145346.

Almost surely, 2^80581378 is an apocalyptic number.

80581378 is a deficient number, since it is larger than the sum of its proper divisors (40290692).

80581378 is a wasteful number, since it uses less digits than its factorization.

80581378 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40290691.

The product of its (nonzero) digits is 53760, while the sum is 40.

The square root of 80581378 is about 8976.7130955601. The cubic root of 80581378 is about 431.9282038035.

The spelling of 80581378 in words is "eighty million, five hundred eighty-one thousand, three hundred seventy-eight".