31804164 has 120 divisors (see below), whose sum is σ = 97845440. Its totient is φ = 8817984.

The previous prime is 31804159. The next prime is 31804177. The reversal of 31804164 is 46140813.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

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 39 ways as a sum of consecutive naturals, for example, 83727 + ... + 84105.

Almost surely, 2^31804164 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 31804164, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (48922720).

31804164 is an abundant number, since it is smaller than the sum of its proper divisors (66041276).

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

31804164 is a wasteful number, since it uses less digits than its factorization.

31804164 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 439 (or 428 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 27.

The square root of 31804164 is about 5639.5180645158. The cubic root of 31804164 is about 316.8312383108.

Adding to 31804164 its reverse (46140813), we get a palindrome (77944977).

The spelling of 31804164 in words is "thirty-one million, eight hundred four thousand, one hundred sixty-four".