31228830 has 48 divisors (see below), whose sum is σ = 85975344. Its totient is φ = 7837440.

The previous prime is 31228829. The next prime is 31228843. The reversal of 31228830 is 3882213.

It is a junction number, because it is equal to n+sod(n) for n = 31228794 and 31228803.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 8676 + ... + 11735.

It is an arithmetic number, because the mean of its divisors is an integer number (1791153).

Almost surely, 2^31228830 is an apocalyptic number.

31228830 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

31228830 is an abundant number, since it is smaller than the sum of its proper divisors (54746514).

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

31228830 is a wasteful number, since it uses less digits than its factorization.

31228830 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20441 (or 20438 counting only the distinct ones).

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

The square root of 31228830 is about 5588.2761205939. The cubic root of 31228830 is about 314.9091196633.

The spelling of 31228830 in words is "thirty-one million, two hundred twenty-eight thousand, eight hundred thirty".