81078030 has 64 divisors (see below), whose sum is σ = 235872000. Its totient is φ = 19654560.

The previous prime is 81078029. The next prime is 81078043. The reversal of 81078030 is 3087018.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 81077985 and 81078003.

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 31 ways as a sum of consecutive naturals, for example, 10680 + ... + 16619.

It is an arithmetic number, because the mean of its divisors is an integer number (3685500).

Almost surely, 2^81078030 is an apocalyptic number.

81078030 is an abundant number, since it is smaller than the sum of its proper divisors (154793970).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

81078030 is a wasteful number, since it uses less digits than its factorization.

81078030 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27326 (or 27320 counting only the distinct ones).

The product of its (nonzero) digits is 1344, while the sum is 27.

The square root of 81078030 is about 9004.3339564901. Note that the first 3 decimals coincide. The cubic root of 81078030 is about 432.8137632106.

The spelling of 81078030 in words is "eighty-one million, seventy-eight thousand, thirty".