31066686 has 96 divisors (see below), whose sum is σ = 82080000. Its totient is φ = 8681904.

The previous prime is 31066663. The next prime is 31066687. The reversal of 31066686 is 68666013.

It is a self number, because there is not a number n which added to its sum of digits gives 31066686.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31066687) by changing a digit.

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 47 ways as a sum of consecutive naturals, for example, 156015 + ... + 156213.

It is an arithmetic number, because the mean of its divisors is an integer number (855000).

Almost surely, 2^31066686 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 31066686, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (41040000).

31066686 is an abundant number, since it is smaller than the sum of its proper divisors (51013314).

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

31066686 is a wasteful number, since it uses less digits than its factorization.

31066686 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 283 (or 270 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 36.

The square root of 31066686 is about 5573.7497252747. The cubic root of 31066686 is about 314.3631577947.

The spelling of 31066686 in words is "thirty-one million, sixty-six thousand, six hundred eighty-six".