30720172 has 24 divisors (see below), whose sum is σ = 61558560. Its totient is φ = 13140480.

The previous prime is 30720161. The next prime is 30720181. The reversal of 30720172 is 27102703.

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 7 ways as a sum of consecutive naturals, for example, 25422 + ... + 26602.

It is an arithmetic number, because the mean of its divisors is an integer number (2564940).

Almost surely, 2^30720172 is an apocalyptic number.

It is an amenable number.

30720172 is an abundant number, since it is smaller than the sum of its proper divisors (30838388).

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

30720172 is a wasteful number, since it uses less digits than its factorization.

30720172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2121 (or 2119 counting only the distinct ones).

The product of its (nonzero) digits is 588, while the sum is 22.

The square root of 30720172 is about 5542.5781004872. The cubic root of 30720172 is about 313.1899958039.

Adding to 30720172 its reverse (27102703), we get a palindrome (57822875).

The spelling of 30720172 in words is "thirty million, seven hundred twenty thousand, one hundred seventy-two".