71018237440 has 80 divisors (see below), whose sum is σ = 171618872832. Its totient is φ = 28183486464.

The previous prime is 71018237393. The next prime is 71018237447. The reversal of 71018237440 is 4473281017.

It is a tau number, because it is divible by the number of its divisors (80).

It is a self number, because there is not a number n which added to its sum of digits gives 71018237440.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71018237447) 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, 215902 + ... + 434338.

Almost surely, 2^71018237440 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 71018237440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (85809436416).

71018237440 is an abundant number, since it is smaller than the sum of its proper divisors (100600635392).

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

71018237440 is a wasteful number, since it uses less digits than its factorization.

71018237440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 218587 (or 218571 counting only the distinct ones).

The product of its (nonzero) digits is 37632, while the sum is 37.

The spelling of 71018237440 in words is "seventy-one billion, eighteen million, two hundred thirty-seven thousand, four hundred forty".