71243020 has 24 divisors (see below), whose sum is σ = 149887584. Its totient is φ = 28444416.

The previous prime is 71242999. The next prime is 71243021. The reversal of 71243020 is 2034217.

It is not an unprimeable number, because it can be changed into a prime (71243021) 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, 8857 + ... + 14863.

It is an arithmetic number, because the mean of its divisors is an integer number (6245316).

Almost surely, 2^71243020 is an apocalyptic number.

It is an amenable number.

71243020 is an abundant number, since it is smaller than the sum of its proper divisors (78644564).

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

71243020 is a wasteful number, since it uses less digits than its factorization.

71243020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6609 (or 6607 counting only the distinct ones).

The product of its (nonzero) digits is 336, while the sum is 19.

The square root of 71243020 is about 8440.5580384238. The cubic root of 71243020 is about 414.5536789700.

Adding to 71243020 its reverse (2034217), we get a palindrome (73277237).

The spelling of 71243020 in words is "seventy-one million, two hundred forty-three thousand, twenty".