30809472 has 32 divisors (see below), whose sum is σ = 81838680. Its totient is φ = 10269696.

The previous prime is 30809413. The next prime is 30809477. The reversal of 30809472 is 27490803.

It is a tau number, because it is divible by the number of its divisors (32).

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30809477) 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 3 ways as a sum of consecutive naturals, for example, 39733 + ... + 40500.

Almost surely, 2^30809472 is an apocalyptic number.

30809472 is a gapful number since it is divisible by the number (32) formed by its first and last digit.

It is an amenable number.

30809472 is an abundant number, since it is smaller than the sum of its proper divisors (51029208).

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

30809472 is an equidigital number, since it uses as much as digits as its factorization.

30809472 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80250 (or 80238 counting only the distinct ones).

The product of its (nonzero) digits is 12096, while the sum is 33.

The square root of 30809472 is about 5550.6280725698. The cubic root of 30809472 is about 313.4931713039.

The spelling of 30809472 in words is "thirty million, eight hundred nine thousand, four hundred seventy-two".