31228500 has 96 divisors (see below), whose sum is σ = 92252160. Its totient is φ = 8208000.

The previous prime is 31228469. The next prime is 31228537. The reversal of 31228500 is 582213.

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 31 ways as a sum of consecutive naturals, for example, 163405 + ... + 163595.

It is an arithmetic number, because the mean of its divisors is an integer number (960960).

Almost surely, 2^31228500 is an apocalyptic number.

31228500 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 31228500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (46126080).

31228500 is an abundant number, since it is smaller than the sum of its proper divisors (61023660).

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

31228500 is a wasteful number, since it uses less digits than its factorization.

31228500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 322 (or 310 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 21.

The square root of 31228500 is about 5588.2465944158. The cubic root of 31228500 is about 314.9080104279.

The spelling of 31228500 in words is "thirty-one million, two hundred twenty-eight thousand, five hundred".