71164820 has 12 divisors (see below), whose sum is σ = 149446164. Its totient is φ = 28465920.

The previous prime is 71164799. The next prime is 71164867. The reversal of 71164820 is 2846117.

It can be written as a sum of positive squares in 2 ways, for example, as 49056016 + 22108804 = 7004^2 + 4702^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1779101 + ... + 1779140.

It is an arithmetic number, because the mean of its divisors is an integer number (12453847).

Almost surely, 2^71164820 is an apocalyptic number.

It is an amenable number.

71164820 is an abundant number, since it is smaller than the sum of its proper divisors (78281344).

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

71164820 is a wasteful number, since it uses less digits than its factorization.

71164820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3558250 (or 3558248 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 29.

The square root of 71164820 is about 8435.9243714012. The cubic root of 71164820 is about 414.4019449654.

The spelling of 71164820 in words is "seventy-one million, one hundred sixty-four thousand, eight hundred twenty".