30731904 has 192 divisors, whose sum is σ = 104807040. Its totient is φ = 8460288.

The previous prime is 30731863. The next prime is 30731917. The reversal of 30731904 is 40913703.

It is a tau number, because it is divible by the number of its divisors (192).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 298317 + ... + 298419.

It is an arithmetic number, because the mean of its divisors is an integer number (545870).

Almost surely, 2^30731904 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 30731904, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (52403520).

30731904 is an abundant number, since it is smaller than the sum of its proper divisors (74075136).

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

30731904 is a wasteful number, since it uses less digits than its factorization.

30731904 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 167 (or 152 counting only the distinct ones).

The product of its (nonzero) digits is 2268, while the sum is 27.

The square root of 30731904 is about 5543.6363517099. The cubic root of 30731904 is about 313.2298597017.

The spelling of 30731904 in words is "thirty million, seven hundred thirty-one thousand, nine hundred four".