81278606 has 16 divisors (see below), whose sum is σ = 123271200. Its totient is φ = 40190880.

The previous prime is 81278579. The next prime is 81278611. The reversal of 81278606 is 60687218.

It is a self number, because there is not a number n which added to its sum of digits gives 81278606.

It is a congruent number.

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 7 ways as a sum of consecutive naturals, for example, 92240 + ... + 93116.

It is an arithmetic number, because the mean of its divisors is an integer number (7704450).

Almost surely, 2^81278606 is an apocalyptic number.

81278606 is a deficient number, since it is larger than the sum of its proper divisors (41992594).

81278606 is a wasteful number, since it uses less digits than its factorization.

81278606 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1339.

The product of its (nonzero) digits is 32256, while the sum is 38.

The square root of 81278606 is about 9015.4648244003. The cubic root of 81278606 is about 433.1703767286.

The spelling of 81278606 in words is "eighty-one million, two hundred seventy-eight thousand, six hundred six".