30708072 has 40 divisors (see below), whose sum is σ = 86012850. Its totient is φ = 10235808.

The previous prime is 30708031. The next prime is 30708079. The reversal of 30708072 is 27080703.

It can be written as a sum of positive squares in only one way, i.e., 30536676 + 171396 = 5526^2 + 414^2 .

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (30708079) 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 9 ways as a sum of consecutive naturals, for example, 23047 + ... + 24342.

Almost surely, 2^30708072 is an apocalyptic number.

It is an amenable number.

30708072 is an abundant number, since it is smaller than the sum of its proper divisors (55304778).

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

30708072 is a wasteful number, since it uses less digits than its factorization.

30708072 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47407 (or 47394 counting only the distinct ones).

The product of its (nonzero) digits is 2352, while the sum is 27.

The square root of 30708072 is about 5541.4864431847. The cubic root of 30708072 is about 313.1488708540.

Adding to 30708072 its reverse (27080703), we get a palindrome (57788775).

The spelling of 30708072 in words is "thirty million, seven hundred eight thousand, seventy-two".