31640006 has 8 divisors (see below), whose sum is σ = 47486304. Its totient is φ = 15811240.

The previous prime is 31640003. The next prime is 31640017. The reversal of 31640006 is 60004613.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 31640006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31640003) 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 3 ways as a sum of consecutive naturals, for example, 1976 + ... + 8196.

It is an arithmetic number, because the mean of its divisors is an integer number (5935788).

Almost surely, 2^31640006 is an apocalyptic number.

31640006 is a deficient number, since it is larger than the sum of its proper divisors (15846298).

31640006 is a wasteful number, since it uses less digits than its factorization.

31640006 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8766.

The product of its (nonzero) digits is 432, while the sum is 20.

The square root of 31640006 is about 5624.9449775087. The cubic root of 31640006 is about 316.2851869174.

Adding to 31640006 its reverse (60004613), we get a palindrome (91644619).

The spelling of 31640006 in words is "thirty-one million, six hundred forty thousand, six".