71231880 has 64 divisors (see below), whose sum is σ = 217339200. Its totient is φ = 18671360.

The previous prime is 71231879. The next prime is 71231899. The reversal of 71231880 is 8813217.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2050 + ... + 12110.

It is an arithmetic number, because the mean of its divisors is an integer number (3395925).

Almost surely, 2^71231880 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 71231880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (108669600).

71231880 is an abundant number, since it is smaller than the sum of its proper divisors (146107320).

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

71231880 is a wasteful number, since it uses less digits than its factorization.

71231880 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10134 (or 10130 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 30.

The square root of 71231880 is about 8439.8981036503. The cubic root of 71231880 is about 414.5320704498.

The spelling of 71231880 in words is "seventy-one million, two hundred thirty-one thousand, eight hundred eighty".