31803828 has 48 divisors (see below), whose sum is σ = 86091264. Its totient is φ = 8949600.

The previous prime is 31803817. The next prime is 31803829. The reversal of 31803828 is 82830813.

It is a super-2 number, since 2×31803828² = 2022966950907168, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31803829) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 2803 + ... + 8453.

It is an arithmetic number, because the mean of its divisors is an integer number (1793568).

Almost surely, 2^31803828 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 31803828, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (43045632).

31803828 is an abundant number, since it is smaller than the sum of its proper divisors (54287436).

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

31803828 is a wasteful number, since it uses less digits than its factorization.

31803828 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5732 (or 5730 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 33.

The square root of 31803828 is about 5639.4882746576. The cubic root of 31803828 is about 316.8301225694.

The spelling of 31803828 in words is "thirty-one million, eight hundred three thousand, eight hundred twenty-eight".