71181620 has 24 divisors (see below), whose sum is σ = 149823744. Its totient is φ = 28407456.

The previous prime is 71181589. The next prime is 71181623. The reversal of 71181620 is 2618117.

It is a self number, because there is not a number n which added to its sum of digits gives 71181620.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71181623) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5417 + ... + 13103.

It is an arithmetic number, because the mean of its divisors is an integer number (6242656).

Almost surely, 2^71181620 is an apocalyptic number.

It is an amenable number.

71181620 is an abundant number, since it is smaller than the sum of its proper divisors (78642124).

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

71181620 is a wasteful number, since it uses less digits than its factorization.

71181620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8159 (or 8157 counting only the distinct ones).

The product of its (nonzero) digits is 672, while the sum is 26.

The square root of 71181620 is about 8436.9200541430. The cubic root of 71181620 is about 414.4345519234.

Adding to 71181620 its reverse (2618117), we get a palindrome (73799737).

The spelling of 71181620 in words is "seventy-one million, one hundred eighty-one thousand, six hundred twenty".