71686780 has 24 divisors (see below), whose sum is σ = 164228400. Its totient is φ = 26067840.

The previous prime is 71686777. The next prime is 71686781. The reversal of 71686780 is 8768617.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71686781) 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, 162705 + ... + 163144.

It is an arithmetic number, because the mean of its divisors is an integer number (6842850).

Almost surely, 2^71686780 is an apocalyptic number.

It is an amenable number.

71686780 is an abundant number, since it is smaller than the sum of its proper divisors (92541620).

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

71686780 is a wasteful number, since it uses less digits than its factorization.

71686780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 325869 (or 325867 counting only the distinct ones).

The product of its (nonzero) digits is 112896, while the sum is 43.

The square root of 71686780 is about 8466.8045920524. The cubic root of 71686780 is about 415.4126248743.

The spelling of 71686780 in words is "seventy-one million, six hundred eighty-six thousand, seven hundred eighty".