71431686 has 32 divisors (see below), whose sum is σ = 162433920. Its totient is φ = 23256072.

The previous prime is 71431639. The next prime is 71431687. The reversal of 71431686 is 68613417.

It is a self number, because there is not a number n which added to its sum of digits gives 71431686.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71431687) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13060 + ... + 17703.

It is an arithmetic number, because the mean of its divisors is an integer number (5076060).

Almost surely, 2^71431686 is an apocalyptic number.

71431686 is an abundant number, since it is smaller than the sum of its proper divisors (91002234).

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

71431686 is a wasteful number, since it uses less digits than its factorization.

71431686 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30817 (or 30811 counting only the distinct ones).

The product of its digits is 24192, while the sum is 36.

The square root of 71431686 is about 8451.7268058072. The cubic root of 71431686 is about 414.9192972215.

It can be divided in two parts, 714 and 31686, that added together give a square (32400 = 180²).

The spelling of 71431686 in words is "seventy-one million, four hundred thirty-one thousand, six hundred eighty-six".