30124720 has 40 divisors (see below), whose sum is σ = 70843680. Its totient is φ = 11911680.

The previous prime is 30124693. The next prime is 30124727. The reversal of 30124720 is 2742103.

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 (30124727) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5005 + ... + 9235.

It is an arithmetic number, because the mean of its divisors is an integer number (1771092).

Almost surely, 2^30124720 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 30124720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35421840).

30124720 is an abundant number, since it is smaller than the sum of its proper divisors (40718960).

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

30124720 is a wasteful number, since it uses less digits than its factorization.

30124720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4333 (or 4327 counting only the distinct ones).

The product of its (nonzero) digits is 336, while the sum is 19.

The square root of 30124720 is about 5488.5990926647. The cubic root of 30124720 is about 311.1532486387.

Adding to 30124720 its reverse (2742103), we get a palindrome (32866823).

It can be divided in two parts, 30 and 124720, that added together give a triangular number (124750 = T₄₉₉).

The spelling of 30124720 in words is "thirty million, one hundred twenty-four thousand, seven hundred twenty".