30912240 has 80 divisors (see below), whose sum is σ = 100886400. Its totient is φ = 7808256.

The previous prime is 30912223. The next prime is 30912247. The reversal of 30912240 is 4221903.

It is a tau number, because it is divible by the number of its divisors (80).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30912247) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1171 + ... + 7949.

It is an arithmetic number, because the mean of its divisors is an integer number (1261080).

Almost surely, 2^30912240 is an apocalyptic number.

30912240 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 30912240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (50443200).

30912240 is an abundant number, since it is smaller than the sum of its proper divisors (69974160).

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

30912240 is a wasteful number, since it uses less digits than its factorization.

30912240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6814 (or 6808 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 21.

The square root of 30912240 is about 5559.8776964966. The cubic root of 30912240 is about 313.8413468196.

The spelling of 30912240 in words is "thirty million, nine hundred twelve thousand, two hundred forty".