71331840 has 260 divisors, whose sum is σ = 261653304. Its totient is φ = 18579456.

The previous prime is 71331823. The next prime is 71331859. The reversal of 71331840 is 4813317.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 1658859 + ... + 1658901.

Almost surely, 2^71331840 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 71331840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (130826652).

71331840 is an abundant number, since it is smaller than the sum of its proper divisors (190321464).

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

71331840 is an equidigital number, since it uses as much as digits as its factorization.

71331840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 84 (or 53 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 27.

The square root of 71331840 is about 8445.8179000023. The cubic root of 71331840 is about 414.7258846902.

The spelling of 71331840 in words is "seventy-one million, three hundred thirty-one thousand, eight hundred forty".