81078075 has 72 divisors (see below), whose sum is σ = 159646032. Its totient is φ = 39087360.

The previous prime is 81078071. The next prime is 81078077. The reversal of 81078075 is 57087018.

It is not a de Polignac number, because 81078075 - 2² = 81078071 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81078071) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 154764 + ... + 155286.

It is an arithmetic number, because the mean of its divisors is an integer number (2217306).

Almost surely, 2^81078075 is an apocalyptic number.

81078075 is a deficient number, since it is larger than the sum of its proper divisors (78567957).

81078075 is a wasteful number, since it uses less digits than its factorization.

81078075 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 605 (or 597 counting only the distinct ones).

The product of its (nonzero) digits is 15680, while the sum is 36.

The square root of 81078075 is about 9004.3364552864. The cubic root of 81078075 is about 432.8138432841.

The spelling of 81078075 in words is "eighty-one million, seventy-eight thousand, seventy-five".