31998828 has 48 divisors (see below), whose sum is σ = 79519104. Its totient is φ = 9980160.

The previous prime is 31998817. The next prime is 31998829. The reversal of 31998828 is 82889913.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (31998829) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 45963 + ... + 46653.

It is an arithmetic number, because the mean of its divisors is an integer number (1656648).

Almost surely, 2^31998828 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 31998828, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (39759552).

31998828 is an abundant number, since it is smaller than the sum of its proper divisors (47520276).

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

31998828 is a wasteful number, since it uses less digits than its factorization.

31998828 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 942 (or 940 counting only the distinct ones).

The product of its digits is 248832, while the sum is 48.

The square root of 31998828 is about 5656.7506574004. The cubic root of 31998828 is about 317.4763344421.

The spelling of 31998828 in words is "thirty-one million, nine hundred ninety-eight thousand, eight hundred twenty-eight".