30724320 has 216 divisors, whose sum is σ = 111206088. Its totient is φ = 7124480.

The previous prime is 30724289. The next prime is 30724333. The reversal of 30724320 is 2342703.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 1335829 + ... + 1335851.

It is an arithmetic number, because the mean of its divisors is an integer number (514843).

Almost surely, 2^30724320 is an apocalyptic number.

30724320 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 30724320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (55603044).

30724320 is an abundant number, since it is smaller than the sum of its proper divisors (80481768).

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

30724320 is a wasteful number, since it uses less digits than its factorization.

30724320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 86 (or 44 counting only the distinct ones).

The product of its (nonzero) digits is 1008, while the sum is 21.

The square root of 30724320 is about 5542.9522819523. The cubic root of 30724320 is about 313.2040913591.

The spelling of 30724320 in words is "thirty million, seven hundred twenty-four thousand, three hundred twenty".