71550437840 has 160 divisors (see below), whose sum is σ = 196497899520. Its totient is φ = 23710579200.

The previous prime is 71550437839. The next prime is 71550437857. The reversal of 71550437840 is 4873405517.

It is a junction number, because it is equal to n+sod(n) for n = 71550437791 and 71550437800.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 17201681 + ... + 17205839.

It is an arithmetic number, because the mean of its divisors is an integer number (1228111872).

Almost surely, 2^71550437840 is an apocalyptic number.

71550437840 is a gapful number since it is divisible by the number (70) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 71550437840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (98248949760).

71550437840 is an abundant number, since it is smaller than the sum of its proper divisors (124947461680).

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

71550437840 is a wasteful number, since it uses less digits than its factorization.

71550437840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5201 (or 5195 counting only the distinct ones).

The product of its (nonzero) digits is 470400, while the sum is 44.

The spelling of 71550437840 in words is "seventy-one billion, five hundred fifty million, four hundred thirty-seven thousand, eight hundred forty".