71089236 has 18 divisors (see below), whose sum is σ = 179697882. Its totient is φ = 23696400.

The previous prime is 71089229. The next prime is 71089259. The reversal of 71089236 is 63298017.

It can be written as a sum of positive squares in only one way, i.e., 71064900 + 24336 = 8430^2 + 156^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a Harshad number since it is a multiple of its sum of digits (36), and also a Moran number because the ratio is a prime number: 1974701 = 71089236 / (7 + 1 + 0 + 8 + 9 + 2 + 3 + 6).

It is a self number, because there is not a number n which added to its sum of digits gives 71089236.

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 5 ways as a sum of consecutive naturals, for example, 987315 + ... + 987386.

Almost surely, 2^71089236 is an apocalyptic number.

It is an amenable number.

71089236 is an abundant number, since it is smaller than the sum of its proper divisors (108608646).

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

71089236 is a wasteful number, since it uses less digits than its factorization.

71089236 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1974711 (or 1974706 counting only the distinct ones).

The product of its (nonzero) digits is 18144, while the sum is 36.

The square root of 71089236 is about 8431.4432928177. The cubic root of 71089236 is about 414.2551811935.

The spelling of 71089236 in words is "seventy-one million, eighty-nine thousand, two hundred thirty-six".