30228440 has 128 divisors (see below), whose sum is σ = 80870400. Its totient is φ = 10053120.

The previous prime is 30228437. The next prime is 30228467. The reversal of 30228440 is 4482203.

It is a Harshad number since it is a multiple of its sum of digits (23).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 293429 + ... + 293531.

It is an arithmetic number, because the mean of its divisors is an integer number (631800).

Almost surely, 2^30228440 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 30228440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (40435200).

30228440 is an abundant number, since it is smaller than the sum of its proper divisors (50641960).

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

30228440 is a wasteful number, since it uses less digits than its factorization.

30228440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 177 (or 173 counting only the distinct ones).

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

The square root of 30228440 is about 5498.0396506391. The cubic root of 30228440 is about 311.5099418239.

The spelling of 30228440 in words is "thirty million, two hundred twenty-eight thousand, four hundred forty".