30720606 has 64 divisors (see below), whose sum is σ = 74718720. Its totient is φ = 8225280.

The previous prime is 30720601. The next prime is 30720629. The reversal of 30720606 is 60602703.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30720601) 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 31 ways as a sum of consecutive naturals, for example, 109186 + ... + 109466.

It is an arithmetic number, because the mean of its divisors is an integer number (1167480).

Almost surely, 2^30720606 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 30720606, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37359360).

30720606 is an abundant number, since it is smaller than the sum of its proper divisors (43998114).

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

30720606 is a wasteful number, since it uses less digits than its factorization.

30720606 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 449.

The product of its (nonzero) digits is 1512, while the sum is 24.

The square root of 30720606 is about 5542.6172518044. The cubic root of 30720606 is about 313.1914706635.

The spelling of 30720606 in words is "thirty million, seven hundred twenty thousand, six hundred six".