30998968 has 128 divisors (see below), whose sum is σ = 80640000. Its totient is φ = 11007360.

The previous prime is 30998909. The next prime is 30998987. The reversal of 30998968 is 86989903.

It is a Harshad number since it is a multiple of its sum of digits (52).

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, 392353 + ... + 392431.

It is an arithmetic number, because the mean of its divisors is an integer number (630000).

Almost surely, 2^30998968 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 30998968, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (40320000).

30998968 is an abundant number, since it is smaller than the sum of its proper divisors (49641032).

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

30998968 is a wasteful number, since it uses less digits than its factorization.

30998968 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 130 (or 112 counting only the distinct ones).

The product of its (nonzero) digits is 839808, while the sum is 52.

The square root of 30998968 is about 5567.6716857229. The cubic root of 30998968 is about 314.1345792813.

The spelling of 30998968 in words is "thirty million, nine hundred ninety-eight thousand, nine hundred sixty-eight".