30805992 has 96 divisors (see below), whose sum is σ = 100401600. Its totient is φ = 8335872.

The previous prime is 30805991. The next prime is 30806003. The reversal of 30805992 is 29950803.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (30805991) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 7968 + ... + 11184.

It is an arithmetic number, because the mean of its divisors is an integer number (1045850).

Almost surely, 2^30805992 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 30805992, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (50200800).

30805992 is an abundant number, since it is smaller than the sum of its proper divisors (69595608).

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

30805992 is a wasteful number, since it uses less digits than its factorization.

30805992 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3255 (or 3248 counting only the distinct ones).

The product of its (nonzero) digits is 19440, while the sum is 36.

The square root of 30805992 is about 5550.3145856789. The cubic root of 30805992 is about 313.4813676037.

The spelling of 30805992 in words is "thirty million, eight hundred five thousand, nine hundred ninety-two".