81080786 has 8 divisors (see below), whose sum is σ = 128775420. Its totient is φ = 38155648.

The previous prime is 81080749. The next prime is 81080807. The reversal of 81080786 is 68708018.

It can be written as a sum of positive squares in 2 ways, for example, as 77352025 + 3728761 = 8795^2 + 1931^2 .

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1192331 + ... + 1192398.

Almost surely, 2^81080786 is an apocalyptic number.

81080786 is a deficient number, since it is larger than the sum of its proper divisors (47694634).

81080786 is a wasteful number, since it uses less digits than its factorization.

81080786 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2384748.

The product of its (nonzero) digits is 21504, while the sum is 38.

The square root of 81080786 is about 9004.4869926054. The cubic root of 81080786 is about 432.8186672157.

The spelling of 81080786 in words is "eighty-one million, eighty thousand, seven hundred eighty-six".