31228164 has 108 divisors (see below), whose sum is σ = 88884432. Its totient is φ = 9234720.

The previous prime is 31228139. The next prime is 31228177. The reversal of 31228164 is 46182213.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 291799 + ... + 291905.

It is an arithmetic number, because the mean of its divisors is an integer number (823004).

Almost surely, 2^31228164 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 31228164, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (44442216).

31228164 is an abundant number, since it is smaller than the sum of its proper divisors (57656268).

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

31228164 is a wasteful number, since it uses less digits than its factorization.

31228164 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 206 (or 190 counting only the distinct ones).

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

The square root of 31228164 is about 5588.2165312379. The cubic root of 31228164 is about 314.9068810165.

The spelling of 31228164 in words is "thirty-one million, two hundred twenty-eight thousand, one hundred sixty-four".