71881037 has 8 divisors (see below), whose sum is σ = 72599736. Its totient is φ = 71165952.

The previous prime is 71881021. The next prime is 71881063. The reversal of 71881037 is 73018817.

It can be written as a sum of positive squares in 4 ways, for example, as 23174596 + 48706441 = 4814^2 + 6979^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 71881037 - 2⁴ = 71881021 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 71880988 and 71881006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71881097) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 54773 + ... + 56069.

It is an arithmetic number, because the mean of its divisors is an integer number (9074967).

Almost surely, 2^71881037 is an apocalyptic number.

It is an amenable number.

71881037 is a deficient number, since it is larger than the sum of its proper divisors (718699).

71881037 is a wasteful number, since it uses less digits than its factorization.

71881037 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1807.

The product of its (nonzero) digits is 9408, while the sum is 35.

The square root of 71881037 is about 8478.2685142663. The cubic root of 71881037 is about 415.7875151447.

The spelling of 71881037 in words is "seventy-one million, eight hundred eighty-one thousand, thirty-seven".