31709828 has 12 divisors (see below), whose sum is σ = 58756572. Its totient is φ = 14922240.

The previous prime is 31709809. The next prime is 31709831. The reversal of 31709828 is 82890713.

It can be written as a sum of positive squares in 2 ways, for example, as 14002564 + 17707264 = 3742^2 + 4208^2 .

It is a junction number, because it is equal to n+sod(n) for n = 31709791 and 31709800.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 233093 + ... + 233228.

It is an arithmetic number, because the mean of its divisors is an integer number (4896381).

Almost surely, 2^31709828 is an apocalyptic number.

It is an amenable number.

31709828 is a deficient number, since it is larger than the sum of its proper divisors (27046744).

31709828 is a wasteful number, since it uses less digits than its factorization.

31709828 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 466342 (or 466340 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 38.

The square root of 31709828 is about 5631.1480179445. The cubic root of 31709828 is about 316.5176714891.

The spelling of 31709828 in words is "thirty-one million, seven hundred nine thousand, eight hundred twenty-eight".