31664206 has 16 divisors (see below), whose sum is σ = 56033280. Its totient is φ = 13132440.

The previous prime is 31664197. The next prime is 31664209. The reversal of 31664206 is 60246613.

It is a super-2 number, since 2×31664206² = 2005243883220872, which contains 22 as substring.

It is a nialpdrome in base 9.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31664209) 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, 36046 + ... + 36913.

It is an arithmetic number, because the mean of its divisors is an integer number (3502080).

Almost surely, 2^31664206 is an apocalyptic number.

31664206 is a deficient number, since it is larger than the sum of its proper divisors (24369074).

31664206 is a wasteful number, since it uses less digits than its factorization.

31664206 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72999.

The product of its (nonzero) digits is 5184, while the sum is 28.

The square root of 31664206 is about 5627.0956984931. The cubic root of 31664206 is about 316.3658037471.

The spelling of 31664206 in words is "thirty-one million, six hundred sixty-four thousand, two hundred six".