30428240 has 40 divisors (see below), whose sum is σ = 71031168. Its totient is φ = 12122240.

The previous prime is 30428239. The next prime is 30428243. The reversal of 30428240 is 4282403.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30428243) 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, 24269 + ... + 25491.

Almost surely, 2^30428240 is an apocalyptic number.

It is an amenable number.

30428240 is an abundant number, since it is smaller than the sum of its proper divisors (40602928).

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

30428240 is a wasteful number, since it uses less digits than its factorization.

30428240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1547 (or 1541 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 23.

The square root of 30428240 is about 5516.1798375325. The cubic root of 30428240 is about 312.1947611507.

The spelling of 30428240 in words is "thirty million, four hundred twenty-eight thousand, two hundred forty".