71997000030 has 96 divisors (see below), whose sum is σ = 190944000000. Its totient is φ = 18817292736.

The previous prime is 71996999989. The next prime is 71997000037. The reversal of 71997000030 is 3000079917.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71997000037) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1169971 + ... + 1229969.

It is an arithmetic number, because the mean of its divisors is an integer number (1989000000).

Almost surely, 2^71997000030 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 71997000030, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (95472000000).

71997000030 is an abundant number, since it is smaller than the sum of its proper divisors (118946999970).

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

71997000030 is a wasteful number, since it uses less digits than its factorization.

71997000030 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60278 (or 60275 counting only the distinct ones).

The product of its (nonzero) digits is 11907, while the sum is 36.

Adding to 71997000030 its reverse (3000079917), we get a palindrome (74997079947).

The spelling of 71997000030 in words is "seventy-one billion, nine hundred ninety-seven million, thirty", and thus it is an aban number.