30805040 has 40 divisors (see below), whose sum is σ = 81854880. Its totient is φ = 10561536.

The previous prime is 30805009. The next prime is 30805079. The reversal of 30805040 is 4050803.

It is a tau number, because it is divible by the number of its divisors (40).

It is a Harshad number since it is a multiple of its sum of digits (20).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 26945 + ... + 28064.

It is an arithmetic number, because the mean of its divisors is an integer number (2046372).

Almost surely, 2^30805040 is an apocalyptic number.

It is an amenable number.

30805040 is an abundant number, since it is smaller than the sum of its proper divisors (51049840).

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

30805040 is a wasteful number, since it uses less digits than its factorization.

30805040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55029 (or 55023 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 20.

The square root of 30805040 is about 5550.2288241117. The cubic root of 30805040 is about 313.4781383906.

Adding to 30805040 its reverse (4050803), we get a palindrome (34855843).

The spelling of 30805040 in words is "thirty million, eight hundred five thousand, forty".