30641840 has 20 divisors (see below), whose sum is σ = 71242464. Its totient is φ = 12256704.

The previous prime is 30641833. The next prime is 30641861. The reversal of 30641840 is 4814603.

It is a tau number, because it is divible by the number of its divisors (20).

It is a hoax number, since the sum of its digits (26) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 191432 + ... + 191591.

Almost surely, 2^30641840 is an apocalyptic number.

It is an amenable number.

30641840 is an abundant number, since it is smaller than the sum of its proper divisors (40600624).

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

30641840 is a wasteful number, since it uses less digits than its factorization.

30641840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 383036 (or 383030 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 26.

The square root of 30641840 is about 5535.5072035000. The cubic root of 30641840 is about 312.9235728160.

The spelling of 30641840 in words is "thirty million, six hundred forty-one thousand, eight hundred forty".