71855140 has 48 divisors (see below), whose sum is σ = 173077632. Its totient is φ = 24546816.

The previous prime is 71855099. The next prime is 71855143. The reversal of 71855140 is 4155817.

It is a super-2 number, since 2×71855140² = 10326322288839200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (71855143) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 46419 + ... + 47941.

It is an arithmetic number, because the mean of its divisors is an integer number (3605784).

Almost surely, 2^71855140 is an apocalyptic number.

71855140 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 71855140, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (86538816).

71855140 is an abundant number, since it is smaller than the sum of its proper divisors (101222492).

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

71855140 is a wasteful number, since it uses less digits than its factorization.

71855140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1876 (or 1874 counting only the distinct ones).

The product of its (nonzero) digits is 5600, while the sum is 31.

The square root of 71855140 is about 8476.7411190858. The cubic root of 71855140 is about 415.7375764168.

The spelling of 71855140 in words is "seventy-one million, eight hundred fifty-five thousand, one hundred forty".