71231980 has 24 divisors (see below), whose sum is σ = 149753520. Its totient is φ = 28461120.

The previous prime is 71231971. The next prime is 71231987. The reversal of 71231980 is 8913217.

It is not an unprimeable number, because it can be changed into a prime (71231987) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 26331 + ... + 28909.

It is an arithmetic number, because the mean of its divisors is an integer number (6239730).

Almost surely, 2^71231980 is an apocalyptic number.

It is an amenable number.

71231980 is an abundant number, since it is smaller than the sum of its proper divisors (78521540).

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

71231980 is a wasteful number, since it uses less digits than its factorization.

71231980 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3969 (or 3967 counting only the distinct ones).

The product of its (nonzero) digits is 3024, while the sum is 31.

The square root of 71231980 is about 8439.9040278904. The cubic root of 71231980 is about 414.5322644322.

The spelling of 71231980 in words is "seventy-one million, two hundred thirty-one thousand, nine hundred eighty".