71565930 has 56 divisors (see below), whose sum is σ = 193159332. Its totient is φ = 19082304.

The previous prime is 71565929. The next prime is 71565931. The reversal of 71565930 is 3956517.

It is a happy number.

71565930 is a `hidden beast` number, since 7 + 1 + 565 + 93 + 0 = 666.

It is an interprime number because it is at equal distance from previous prime (71565929) and next prime (71565931).

It can be written as a sum of positive squares in 2 ways, for example, as 66048129 + 5517801 = 8127^2 + 2349^2 .

It is not an unprimeable number, because it can be changed into a prime (71565931) by changing a digit.

It is a polite number, since it can be written in 27 ways as a sum of consecutive naturals, for example, 2382 + ... + 12198.

Almost surely, 2^71565930 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 71565930, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (96579666).

71565930 is an abundant number, since it is smaller than the sum of its proper divisors (121593402).

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

71565930 is an equidigital number, since it uses as much as digits as its factorization.

71565930 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9842 (or 9827 counting only the distinct ones).

The product of its (nonzero) digits is 28350, while the sum is 36.

The square root of 71565930 is about 8459.6648869799. The cubic root of 71565930 is about 415.1790585515.

The spelling of 71565930 in words is "seventy-one million, five hundred sixty-five thousand, nine hundred thirty".