81084070 has 16 divisors (see below), whose sum is σ = 148130928. Its totient is φ = 31949280.

The previous prime is 81084061. The next prime is 81084083. The reversal of 81084070 is 7048018.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 59841 + ... + 61180.

It is an arithmetic number, because the mean of its divisors is an integer number (9258183).

Almost surely, 2^81084070 is an apocalyptic number.

81084070 is a deficient number, since it is larger than the sum of its proper divisors (67046858).

81084070 is a wasteful number, since it uses less digits than its factorization.

81084070 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 121095.

The product of its (nonzero) digits is 1792, while the sum is 28.

The square root of 81084070 is about 9004.6693442902. The cubic root of 81084070 is about 432.8245105948.

The spelling of 81084070 in words is "eighty-one million, eighty-four thousand, seventy".