30128440 has 32 divisors (see below), whose sum is σ = 69446160. Its totient is φ = 11756800.

The previous prime is 30128429. The next prime is 30128443. The reversal of 30128440 is 4482103.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30128443) 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, 7546 + ... + 10825.

Almost surely, 2^30128440 is an apocalyptic number.

It is an amenable number.

30128440 is an abundant number, since it is smaller than the sum of its proper divisors (39317720).

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

30128440 is a wasteful number, since it uses less digits than its factorization.

30128440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18423 (or 18419 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 22.

The square root of 30128440 is about 5488.9379664922. The cubic root of 30128440 is about 311.1660558664.

The spelling of 30128440 in words is "thirty million, one hundred twenty-eight thousand, four hundred forty".