30724740 has 72 divisors (see below), whose sum is σ = 93981888. Its totient is φ = 8124480.

The previous prime is 30724723. The next prime is 30724741. The reversal of 30724740 is 4742703.

It is a Smith number, since the sum of its digits (27) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (30724741) by changing a digit.

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 23 ways as a sum of consecutive naturals, for example, 22929 + ... + 24231.

It is an arithmetic number, because the mean of its divisors is an integer number (1305304).

Almost surely, 2^30724740 is an apocalyptic number.

30724740 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 30724740, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (46990944).

30724740 is an abundant number, since it is smaller than the sum of its proper divisors (63257148).

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

30724740 is a wasteful number, since it uses less digits than its factorization.

30724740 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1449 (or 1444 counting only the distinct ones).

The product of its (nonzero) digits is 4704, while the sum is 27.

The square root of 30724740 is about 5542.9901677705. The cubic root of 30724740 is about 313.2055185143.

The spelling of 30724740 in words is "thirty million, seven hundred twenty-four thousand, seven hundred forty".