71855420 has 72 divisors (see below), whose sum is σ = 186800544. Its totient is φ = 22733568.

The previous prime is 71855393. The next prime is 71855429. The reversal of 71855420 is 2455817.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71855429) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 22142 + ... + 25178.

It is an arithmetic number, because the mean of its divisors is an integer number (2594452).

Almost surely, 2^71855420 is an apocalyptic number.

71855420 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 71855420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (93400272).

71855420 is an abundant number, since it is smaller than the sum of its proper divisors (114945124).

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

71855420 is a wasteful number, since it uses less digits than its factorization.

71855420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3079 (or 3064 counting only the distinct ones).

The product of its (nonzero) digits is 11200, while the sum is 32.

The square root of 71855420 is about 8476.7576348507. The cubic root of 71855420 is about 415.7381164216.

The spelling of 71855420 in words is "seventy-one million, eight hundred fifty-five thousand, four hundred twenty".