30709872 has 30 divisors (see below), whose sum is σ = 85945392. Its totient is φ = 10236576.

The previous prime is 30709867. The next prime is 30709873. The reversal of 30709872 is 27890703.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an alternating number because its digits alternate between odd and even.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30709873) 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 5 ways as a sum of consecutive naturals, for example, 106488 + ... + 106775.

Almost surely, 2^30709872 is an apocalyptic number.

It is an amenable number.

30709872 is an abundant number, since it is smaller than the sum of its proper divisors (55235520).

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

30709872 is a wasteful number, since it uses less digits than its factorization.

30709872 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 213277 (or 213268 counting only the distinct ones).

The product of its (nonzero) digits is 21168, while the sum is 36.

The square root of 30709872 is about 5541.6488521017. The cubic root of 30709872 is about 313.1549892991.

The spelling of 30709872 in words is "thirty million, seven hundred nine thousand, eight hundred seventy-two".