30992000 has 128 divisors (see below), whose sum is σ = 83538000. Its totient is φ = 11366400.

The previous prime is 30991993. The next prime is 30992009. The reversal of 30992000 is 29903.

It can be written as a sum of positive squares in 8 ways, for example, as 1658944 + 29333056 = 1288^2 + 5416^2 .

It is a tau number, because it is divible by the number of its divisors (128).

It is not an unprimeable number, because it can be changed into a prime (30992009) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 207926 + ... + 208074.

Almost surely, 2^30992000 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 30992000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (41769000).

30992000 is an abundant number, since it is smaller than the sum of its proper divisors (52546000).

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

30992000 is a wasteful number, since it uses less digits than its factorization.

30992000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 191 (or 169 counting only the distinct ones).

The product of its (nonzero) digits is 486, while the sum is 23.

The square root of 30992000 is about 5567.0458952662. The cubic root of 30992000 is about 314.1110402850. Note that the first 3 decimals are identical.

The spelling of 30992000 in words is "thirty million, nine hundred ninety-two thousand".