71081028 has 36 divisors (see below), whose sum is σ = 180026028. Its totient is φ = 23647680.

The previous prime is 71080991. The next prime is 71081057. The reversal of 71081028 is 82018017.

It can be written as a sum of positive squares in 2 ways, for example, as 20358144 + 50722884 = 4512^2 + 7122^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a junction number, because it is equal to n+sod(n) for n = 71080992 and 71081010.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 20458 + ... + 23678.

It is an arithmetic number, because the mean of its divisors is an integer number (5000723).

Almost surely, 2^71081028 is an apocalyptic number.

It is an amenable number.

71081028 is an abundant number, since it is smaller than the sum of its proper divisors (108945000).

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

71081028 is a wasteful number, since it uses less digits than its factorization.

71081028 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3844 (or 3839 counting only the distinct ones).

The product of its (nonzero) digits is 896, while the sum is 27.

The square root of 71081028 is about 8430.9565293625. The cubic root of 71081028 is about 414.2392372073.

The spelling of 71081028 in words is "seventy-one million, eighty-one thousand, twenty-eight".