30442640 has 20 divisors (see below), whose sum is σ = 70779324. Its totient is φ = 12177024.

The previous prime is 30442627. The next prime is 30442669. The reversal of 30442640 is 4624403.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 11641744 + 18800896 = 3412^2 + 4336^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 190187 + ... + 190346.

Almost surely, 2^30442640 is an apocalyptic number.

It is an amenable number.

30442640 is an abundant number, since it is smaller than the sum of its proper divisors (40336684).

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

30442640 is a wasteful number, since it uses less digits than its factorization.

30442640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 380546 (or 380540 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 23.

The square root of 30442640 is about 5517.4849342794. The cubic root of 30442640 is about 312.2440015446.

The spelling of 30442640 in words is "thirty million, four hundred forty-two thousand, six hundred forty".