71066970 has 160 divisors (see below), whose sum is σ = 218444688. Its totient is φ = 16422912.

The previous prime is 71066959. The next prime is 71066993. The reversal of 71066970 is 7966017.

It can be written as a sum of positive squares in 8 ways, for example, as 33281361 + 37785609 = 5769^2 + 6147^2 .

It is a Curzon 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 79 ways as a sum of consecutive naturals, for example, 178812 + ... + 179208.

Almost surely, 2^71066970 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 71066970, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (109222344).

71066970 is an abundant number, since it is smaller than the sum of its proper divisors (147377718).

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

71066970 is a wasteful number, since it uses less digits than its factorization.

71066970 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 446 (or 437 counting only the distinct ones).

The product of its (nonzero) digits is 15876, while the sum is 36.

The square root of 71066970 is about 8430.1227749067. The cubic root of 71066970 is about 414.2119267828.

The spelling of 71066970 in words is "seventy-one million, sixty-six thousand, nine hundred seventy".