81067478 has 16 divisors (see below), whose sum is σ = 122943744. Its totient is φ = 40089000.

The previous prime is 81067477. The next prime is 81067487. The reversal of 81067478 is 87476018.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81067477) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 83351 + ... + 84317.

It is an arithmetic number, because the mean of its divisors is an integer number (7683984).

Almost surely, 2^81067478 is an apocalyptic number.

81067478 is a deficient number, since it is larger than the sum of its proper divisors (41876266).

81067478 is a wasteful number, since it uses less digits than its factorization.

81067478 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1387.

The product of its (nonzero) digits is 75264, while the sum is 41.

The square root of 81067478 is about 9003.7479973620. The cubic root of 81067478 is about 432.7949860360.

The spelling of 81067478 in words is "eighty-one million, sixty-seven thousand, four hundred seventy-eight".