30805904 has 40 divisors (see below), whose sum is σ = 64926648. Its totient is φ = 14100480.

The previous prime is 30805903. The next prime is 30805919. The reversal of 30805904 is 40950803.

It can be written as a sum of positive squares in 4 ways, for example, as 23232400 + 7573504 = 4820^2 + 2752^2 .

It is not an unprimeable number, because it can be changed into a prime (30805903) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8534 + ... + 11594.

Almost surely, 2^30805904 is an apocalyptic number.

30805904 is a gapful number since it is divisible by the number (34) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 30805904, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32463324).

30805904 is an abundant number, since it is smaller than the sum of its proper divisors (34120744).

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

30805904 is a wasteful number, since it uses less digits than its factorization.

30805904 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3123 (or 3117 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 29.

The square root of 30805904 is about 5550.3066581947. The cubic root of 30805904 is about 313.4810691078.

The spelling of 30805904 in words is "thirty million, eight hundred five thousand, nine hundred four".